Order FloPlast Drain Guard Black 305mm at Screwfix. uk. Order Online. Hepworth Clay RGP6 100mm Yard Gully with B125 Grating and Frame. Terrain Drainage Systems Polypipe. As a constant and reliable presence in Inverness-shire for many years. 48 was £1. Hepworth manufactures and markets integrated piping systems to the civil and building construction sectors. Catalogue Raisonné Barbara Hepworth. 450mm square is one of the more common sizes in domestic settings. Part of Qatar Plastic Additives amp Industries Group. Hepworth is the No. Hepworth Clay drainage system comprises a range of perforated and non-perforated vitrified clay pipes supplied complete with factory-fitted push-fit flexible couplings or plain ended with separate couplings to be fitted on site. Marshalls Landscaping 14. Delivery or pick up local to you Hepworth Plastidrain from a highly recommended trusted company. PP. Bends, junctions and fittings are available in 100mm, 150mm, 225mm and 300mm diameters. For above ground, we carry top-quality channel drains for efficient rainwater drainage. Sizes (nominal) SPIC2/1 inspection chamber 475 mm, depth 595 mm. Secure demounting & joint recognition. - Polyethylene gully: MGP2/2 – Polyethylene gully, 150 mm diameter. 5T PP Square to Round Manhole Cover & Frame. Location : Warehouse 5, Near Al Ahli Driving Centre, Al Quoz Industrial Area 4 City : DXB P. £300. Black. Our range of uPVC systems offers comprehensive solutions required to complete any domestic or industrial drainage system. Hepworth pvc pipe catalogue pdf. HDPE Pipe Fittings from AGRU America. I've. PRODUCT APPRAISAL NO 98 8 HEPWORTH. Wavin OsmaDrain. Contact us for inquiries or to place an order – we’re here to assist you every step of the way. Delivery or pick up local to you Hepworth Drainage from a highly recommended trusted company. Drain Guard. Hepworth Corys Welcome To Danish International. Worldwide Supplier National Plastic. Largest Range & Stock of Channel Drainage in the UK. Diameter . The outstanding temperature rating up to 95 0 C and pressure rating up tp 25 Bar make PP-R system the ideal solution for variety of applications including: Hot and cold potable water piping. Rainwater Guttering and Fittings. Hepworth Clay drainage pipes. Load class according to EN 1433 . Clay is 100% natural and 100% recyclable for ultimate sustainability. The inherent strength and durability of clay provide benefits to installers, specifiers and users: Installation – Reduced, recycled or re-used material can be used instead of primary. Gravel or stones can also be at the bottom of a planter, but only to thinly cover and protect the drainage holes and not as a thick solid layer. Drain Connectors Fit Clay and Plastic Systems Internal Drain Connector – To Waste 100mm to 32/40mm Waste 100 S/S460 100mm to 50mm Waste 100 S/S462 Internal Blanking Plug 100mm 100 S/S89Hepworth Plastic Drain Cover. Drainage. Currently in Stock. uPVC Drainage Pipes and Fittings. Commercial Water Management Solutions. length-mm. uPVC Pipes Thai Pipe. 4. Anti Odour Floor Shower Drain Vertical Outlet 40mm Diameter Grade 304 AQD-206A-SS. Lifetime jetting guarantee up to 7500 psi. Covers drains 300mm wide x 265mm. It’s not hard to see why they’re trusted in commercial, high-rise, domestic, industrial, and public sector buildings across the UK. Take your Phillips screwdriver or socket wrench and tighten the bolts to secure the connector. Georg. 1. ACO Hexdrain Pro Channel Drain 138mm x 150mm x 1000mm - C250 Load. Hepworth Clay mini access chamber base 100/110mm 215mm deep. HDPE Polyethylene Pipes General Specification Kuzeyboru. Not only is underground drainage a better choice for sanitary reasons, but it removes the need for an unsightly. Hepworth Clay drainage system comprises a range of perforated and non-perforated vitrified clay pipes supplied complete with factory-fitted push-fit flexible couplings or plain ended with separate couplings to be fitted on site. Leading brand. Clay’s main benefits are its durability and longevity, plus it has a. Plumber news; General builder news; Above ground specifier news; Below ground specifier news; Construction professional news; About Us. Australia‘s leading supplier of bathroom and plumbing products with over 450 stores across the country. Hepworth Clay mini access chamber 300mm 600mm deep. 3 (8)SuperSleve products are suitable for foul and surface water drainage in adoptable, industrial, commercial and highway drainage applications. BIM revit packages; Technical tools; E-learning courses; Stockist locator; All document downloads; Blog. Similar products. Wavin OsmaDrain OsmaDrain offers the most complete range of foul drainage systems. 40, Sch. Hepworth Rainwater Soil and Waste PDM. Add to basket. In below-ground drainage category the parties' combined share of supply will exceed 25 per cent in U-drain plastic products, U-drain products (all materials) and in the sewer adoptable segment (all materials), as shown in Table 2. Monday - Friday 8. Gulf Construction Online Hepworth is a specialist in. 1. Hepworth SuperSleve inspection chambers are supplied complete with multi inlets to connect directly to SuperSleve pipe systems, any or all inlets can be easily adapted to Plastic drainage. £89. Wavin Osma UltraRib. 27. Hepworth. 00 incl VAT. Hepworth upvc puddle flange pdf files ExtendedManuals com. 56 £440. Your one-stop shop for all piping needs. Geberit Piping Systems Catalogue 2010/2011 int. RIGHT RESULT. Edlington Lane, Edlington, Doncaster, South Yorkshire, DN12 1BY. Kunststoffe. Location : Shed No 18, Dar Mx Roundabout, Ajman Industrial Area 1 City : AJM P. Polypipe Half Round External Stop End 112mm Black. National Plastic can provide a range of fittings from its own Ezyflo brand or from Redi and Hunter. Hepworth Plastic Products Materials 01 Identification of. 01709 856300. Hepworth. DWV & Sewer 290. Tools. While the cost of almost UPVC PIPES AND FITTINGS. Gulf Construction Online Hepworth is a specialist in. 3 4MB uPVC Sewer amp Drainage Systems. 110mm Underground Drainage; Round Gully Grid; Back to 110mm Underground Drainage Round Gully Grid Black by Aquaflow Product Code: 71323 71323. Find out more about Sustainability. UPVC Pressure Pipes amp Fittings Corys Build Centre. PEX Pipe & Fittings 940. Free Hepworth Hdpe online. Wide range of fittings to choose from. Let Willie's design and optimize your drainage project to ensure that the project is handled by drainage experts who will do the job right the first time. These are known as ‘crocks’ and they cover the drainage holes to stop compost blocking them and ensure excess moisture when watering plants can flow out the holes. £58. uk manufacturer of plastic plumbing and drainage products wavin web with some of the best pvc pipes on the market we provide a whole host of plastic tubing and pipe fittings to help you achieve the finish you want. 79: Hepworth Building 205mm Plastic Silt Bucket Ibp3 £215. Starwell Middle East General Trading LLC. We offer a range of silt traps, flow control units and adaptors are also available to complete the system. Hepworth spent two decades marketing and supplying UK upvc pipes and fittings. Hepworth upvc puddle flange pdf files ExtendedManuals com. 72 Inc VAT £8. Match case. my 1 / 8. drainage systems for both housing and civils projects, communication and power ducting and surface water collection and dispersal. The Soakaway Boxes are manufactured to the same exacting standards as other high-quality brands such as the Wavin Aquacell crates. Soil pipes. ) A35 = Equivalent to Class A35 load category BS. (1) £70. AQUADRAIN. 00 incl VAT. Black polypropylene gully grid with downpipe knock-out section. Clay pipes for underground drainage, including the Hepworth range of SuperSelve pipes with fitted couplings, deliver durability you can trust. Besides culverts, common applications for highway drainage are. Part of Qatar Plastic Additives amp Industries Group. Size: 205mm, Finish: Plastic, TSI Code. £3. The Garastor control unit can be used as a flow control device, linked to AquaCell units or a void space under the floor slab of a single residential dwelling. FREE next day delivery available, free collection in 1. Hepworth. Plastic Construction. 3 4MB uPVC Sewer amp Drainage Systems. While the cost of almost. Plain ended system with push-fit flexible couplings for use in adoptable, housing, commercial, industrial and highway drainage. For connecting downpipe directly to underground drainage section. com. £79. 01709 856300. PVC Pipe And Fitting Dynamic CAD Block include Elbow 45, Elbow 90, Ts Socket, Ts Valve Socket, Ts Faucet Socket, Socket, Reducing Socket, Tee Way, Tee And Y-way, Y-way for. 5 acres of yard space, and of course our very successful website For more than 40 years, Hepworth has led the field in the designand manufacturing of special plastic fittings. 3 4MB uPVC Sewer amp Drainage Systems Marley Pipe Systems. A 500mm diameter chamber approved to BS 7158 for use down to 3. Hepworth - Clay. Add to basket. Telephone 0844 5561818 calls are charged at 7p per minute PLUS your telephone network will charge you which can be significant. £25 off! Buy your plastic, steel or cast iron A15 ACO Channel Drainage here today with next-day delivery and excellent customer service - Shop ACO Drainage today!Buy Hep2o Fittings at Screwfix. Hepworth Clay drainage system comprises a range of perforated and non-perforated vitrified clay pipes supplied complete with factory-fitted push-fit flexible couplings or plain ended with separate couplings to be fitted on site. A thick layer can reduce the. Our in-house experienced technical team are available to support and advice on correct product selection. 6m (711543) 150mm X 1. Dubai HEPWORTH brand dealers agents distributor. Find the top PVC pipe fittings suppliers in UAE. Cover loading EN124 A15 35kN. Hepworth Clay mini access chamber cover and frame 345x345mm. Hepworth Threshold Drain - PVCU drainage system. Supplier National Plastic. Hepworth. Buy online Hepworth Plastidrain at MyTub trade counter. Click & Collect Delivery. Related Hepworth Drainage Products: 225x100mm Yard Gulley Med Grate Rgp6 £843. The difference between soil and waste pipes is that soil pipes carry water and solids into the sewer from your toilet, bidet or urinal. Geberit HDPE Installation Guide. vat) on Plastic Items Over £150 (excl. Sewer Systems. A backdrop is a drop shaft situated prior to a manhole or chamber, the main difference from a standard drop shaft being the telescopic arm that continues through into the chamber wall so as to allow access back into the incoming. Bulk Price: £9. Hot and Cold solutions. Hepworth Universal PPIC Round Ductile Cover & Frame 80mm x. Qatar Pipeline amp Fittings HDPE Catalogue Polyethylene. Filters. 30 - 15:00 hours. Take a look at our other Hepworth Clay drainage pipes product ranges Saddle 12 variations Fitting with 3 connections 43 variations Fitting with 2 connections 74 variations Infiltration gully 20 variations All Hepworth Clay drainage pipes products Solutions. £8. Clark Drain CLKS 499 reducing ring to restrict access to 350mm. Delivery or pick up local to you Hepworth Soil And Rainwater from a highly recommended trusted company. HDPE Drainage Pipes amp Fittings Hepworth P M E LLC CORYS Phone and Map of Address Nad Al Hammar Road Ras Al. PVC Electrical Conduit;. Add to basket. £72. Clark Drain Inspection Chamber Manhole Cover 450mm Diameter. Brett Martin Perforated Blown Socket Plastic Underground Drain Pipe More Options. com our staff will be happy to help. Hepworth SuperSleve inspection chambers are supplied complete with multi inlets to connect directly to SuperSleve pipe systems, any or all inlets can be easily adapted to Plastic drainage systems with the adaptor provided. For every consulting engineer making a choice today, it is the natural choice for the future. S. 450mm 3. HDPE MDPE LDPE pressure systems Hepworth. 3 4MB uPVC Sewer amp. 330 mm. Free Delivery. . Comopex Pex Pipes and Fittings. A: Dig a trench for the drainage pipe about 1-1/2 to 2 feet deep and 8 to 9 inches wide. Gulf. Hep2O plumbing fittings including Hepworth. Cosmoplast, a primary member of Group Harwal, has been at the forefront of the plastic industry in the Gulf region since it's founding in 1976. 93 Ex VAT. With a comprehensive range of products, expert advice, and flexible delivery options. These products include EN1401-1/ BS4660:2000 Underground Drainage Pipe and drain pipe fittings in 110mm, 160mm, 200mm,. by Bastian Ben Posted on June 7, 2023. List of 20+ HEPWORTH dealers, HEPWORTH brand agents & distributors in UAE. Designed to hold a small amount of water which then works to prevent harmful sewer gases and bacteria entering a room or building, while also allowing wastes to pass through. Attenuate press infiltrate. 01709 856300. 110mm 87. KG System PVC Ostendorf Kunststoffe. Orders; Downloads;. uPVC Drainage Pipes and Fittings. Ridgidrain is used for non-pressurised surface and sub-surface drainage applications. Transport of wide range of fluids in the industry. 5mm 5 Pack (11326) (8) compare. co. Shallow inspection chambers; Deep inspection chambers; Hepworth Clay inspection chambers;. - Clay traps: Supplied complete with filter basket, spatula, cover and frame and 100/110 conversion adaptors. Hepworth PME LLC also provides pipes and fitting for gravity drainage installation for effective disposal of waste water. bend and a flexi seal at Jewsons but the clay pipe will not fit in the rebated hole which is clearly designed for 110mm plastic. Whether it’s domestic, adoptable, commercial or industrial drainage you are installing. Our new range of inspection chambers to BS EN 13598 can be used in these scenarios. 00 incl VAT. Essential Product Range – Products we know you need day in and day out to get the job done. Wolseley is the UK's largest drainage supplier. Hopper. Hepworth SuperSleve clay drainage system comprises a range of vitrified clay pipes, bends, junctions. HDPE Polyethylene Pipes General Specification Kuzeyboru. Showing 1 - 21 of 21 products. Add to basket. Add to basket. Loading Classification for Covers and Frames: A15 = Equivalent to Class A15 load category of BS EN 124-1 2015 and BS ISO 15398 2012 (Areas which can only be used by pedestrians and. Company Registration No: 01647362. Cosmoplast manufacture sizes upto 1200mm in accordance with the following standards: BSEN 1452 – 2 : 2009 Plastic piping systems for water supply – Unplasticised Polyvinyl Chloride (PVC-U). by Draftman. Delivery or pick up local to you Hepworth Plastidrain from a highly recommended trusted company. • Choice of Standard or Barrier pipe. Download Catalog Cosmoplast. Registration number: 00636445. £32. Download. Sunday - Closed. Compatible with Polypipe, Hepworth, Osma, Hunter, Marley, Brett & Marshall Tufflex. Product Height. Hepworth Clay from Wavin is the No. Hepworth Plastic Products. 1. HepFlow® Linear Drainage -. Hepworth’s drainage pedigree was forged in 1858 when Hepworth Iron Company Ltd was founded to mine iron and later produce sanitary pipes and fire bricks. 110mm 45° S/S Underground Drainage Bend. Hepworth Clay. The Hepworth Plastic Manhole Cover Is A Large Yellow Manhole Blocker. 00 incl VAT. Welcome to Innes Pipes Ltd, we are an independently owned drainage and builder’s merchants specialising in the supply and distribution of underground pipes and associated products for use in ground works associated with civil engineering, building, agriculture and forestry. HEPWORTH (UPVC DRAINAGE PIPES & FITTINGS) UPVC DRAINAGE PIPES &. 108 mm. PG1. These unique features make Cosmoplast Polyethylene pipes & fittings the best option for various applications like: Municipal & Industrial water transmission systems. Easily installed without any specialist tools and fully reversable. Hepworth Clay inspection chambers are manufactured under a Quality Management system to BS EN ISO 9001. While the cost of almost UPVC PIPES online. The Hepworth SuperSleve clay drainage system is available in 100mm, 150mm, 225mm and 300mm diameters for use in adoptable sewers, commercial or industrial construction, highways and general building drainage. ASTM D3034 PSM PVC Sewer PIpe - Dimensions Dimensions of PSM PVC sewer pipe. are transported under pressure. qa MESAIEEDACO Eyeled Lighting Cable Splitter - 300mm x 300mm. Most and Best General Trading Co LLC, Dubai, Contact: 04-2666510; Build World General Trading LLC, Dubai, Contact: 04-3478834drainage, clay would be the product you’d invent. An interceptor trap is probably the most crucial part of a drainage system and I believe they were seriously introduced in Victorian times instigated as a result of epidemics such as. Our High Visibility Plastic Temporary Manhole Cover is designed to fit 600 x 600mm and 675 x 675mm square ground openings. 5027888157577. £4. Whether it’s simply drainage parts you require, or a complete drainage system, we can help. Service you would expect from a recommended trusted UK company. UK manufacturer of plastic plumbing and drainage products. FloPlast Gulley Grid Black 150mm x 150mm (16499) FloPlast Gulley Grid Black 150mm x 150mm. Free Hepworth Hdpe Catalogue PDF ePub Mobi. Material quality . While the cost of almost. Your job is made simple and easy with our various classes of pressure pipe and fittings. Registered Office: Merchant House, Binley Business. 48. Hepworth Plastic Products Materials 01 Identification of. 120 ASTM D-2241 SDR Series BS-3505-86 Class B, C, D and E BS - 3505 Class O DIN 19534 ASTM D-2664 DWV DIN 19531 BS 5255 THERMOPLASTIC WASTE PIPE BS 4514 Soil and Ventilization BS 4660 & 5481 Underground Sewerage NEMATC-2, TC-4,. For use with 475mm PPIC. Gravity sewer feeds are common ways to transport foul and sewage water through drainage. Hepworth Framework is one of the UK's premier manufacturers and installers of aluminium windows, bi-fold doors, entrance doors, access doors, emergency doors, curtain walling, shop front facades and glazing systems to the commercial and residential industries. Hepworth PME LLC Dubai UAE ATN Media Free Zone LLC. HDPE drainage. It is also a highly efficient way to transport wastewater to a sewage treatment facility from your home. HEPWORTH PIPES PTY LTD PRODUCT APPRAISAL NO 98 8 HEPWORTH. They are suitable for use in both adoptable and non-adoptable applications to a maximum depth of 0. 29%. Hepworth SA1/1 HouseDrain Adaptor To 100mm Unjointed Socket 100mm. . Free Download Here pdfsdocuments2 com. Hepworth Plastic Products Materials 01 Identification of. Drainage System Reece Plumbing. 450mm 3. Buy online Hepworth Drainage at MyTub trade counter. Silver Tray, Black Frame 1. YEAR Clay Drainage SuperSleve & Flexseal Products. 00 : 110mm Double Socket Drain Bend 30dg: NrHDPE drainage. AQUA DATA SHEET 2015 Incledon. Call us - 01249 471 187. Geberit HDPE Drainage System Reece Plumbing. Size: 150mm, Finish: Vitrified Clay, TSI Code: 9792526, EAN Code: 5027888020147. In 2009 Hepworth PME (Qatar) WLL became the first plastic pipe manufacturer in Qatar to achieve “kitemark” third party certification on its soil & waste and drainage products, clearly demonstrating the company`s commitment and dedication to supplying its customers with the highest quality piping systems. It’s the very first twinwall surface water drainage system in the UK with Highways Authority Product Approval Scheme (HAPAS) status (up to 900mm). Plastic Poly Pipe, HDPE, and PVC Pipe. Registered Office: Wolseley UK, 2 Kingmaker Court, Warwick Technology Park, Gallows Hill, Warwick, CV34 6DY. BS EN1401-1:2009 Plastics piping systems for non-pressure underground drainage and sewerage – PVC-U. Order FloPlast Press-Fit Square Grid Hopper 110mm at Screwfix. Range Hepworth Clay inspection chambers are supplied complete with multi inlets to connect directly to SuperSleve pipe systems, any or all inlets can be easily adapted to plastic drainage systems with the adaptor provided. Box 50207, Doha, Qatar Tel: +974 44506810 Fax: +974 44506811 Email: info@hepworthpme. Hepworth Clay pipes & fittings - used for the majority. Inspection Chambers . product-description. Hepworth PME LLC AEC Online. View options. FREE Click & Collect within 30 minutes. 3 4MB uPVC Sewer amp Drainage Systems. Add to basket. Download. Registered in England and Wales. Hepworth SuperSleve offers a range of multi inlet access and inspection chambers for private drainage applications up to a maximum depth of 1. VAT £1. Hepworth - Clay. We’re often asked how the two systems can work together, so we've pulled together our most frequently asked questions to help you out. 52. Soil pipes. HEPWORTH PME QATAR WLL in Doha Qatar. High quality channel drainage systems available in black HDPE gratings or galvanised steel gratings available at Plastics Express. Hepworth is a specialist in uPVC pipes February 2001 UK-based Hepworth spent two decades marketing and supplying uPVC pipes and fittings in the region before setting up its manufacturing facility in Dubai, UAE. Terrain Drainage Systems Polypipe. Add to basket. Hepworth P M E LLC CORYS Pipe amp Pipe. Select Country My PortalHepworth. Telephone 0844 5561818 calls are charged at 7p per minute PLUS your telephone network will charge you which can be significant. uPVC. Clay is a 100% natural and plentiful raw material. Terrain Drainage Systems Terrain Drainage n It can have a maximum of six waste inlets up to 56mm on HDPE or 50mm on the PVC Corys is the holding company for Hepworth PME LLC Corys is a brand born from a strong heritage For more than 35 years the Abdul. We find these clay pipes easy to work with and install and for the client are proven to handle the hazardous substances once in use. The products channel. ae. L. Wish List (0) My Account. Product Quantity. uk 3 Features and Benefits •. Hepworth Clay pipes are. Solutions: - don't keep your house too clean so that there is always an alternative food source. RRP incl. Hepworth Building Part number . We can handle. Wide selection, of high-quality products. Below Ground Drainage. A selection of downpipe fixings and running outlets are available to connect your guttering to your drainpipe. The difference between soil and waste pipes is that soil pipes carry water and solids into the sewer from your toilet, bidet or urinal. Email : sales@royalallied. Terrain Drainage Systems Polypipe. Cable Protection Systems. 2m)450mm PPIC manhole chambers are installed to create a change-of-direct and/or rodding access and inspection points for. Bends, junctions and fittings are available in 100mm, 150mm, 225mm and 300mm diameters. Gulf Construction Online Hepworth is a specialist in. Friday 8. uPVC Drainage Pipes and Fittings. 50 incl VAT. Please note that these systems are not interchangeable. FloPlast Gutter Compatibility Chart (PDF) Our main supplier of plastic guttering systems is FloPlast, however, their products will fit very easily and connect with other systems that you or your neighbouring property might have fitted already, such as Hepworth, Brett Martin, Marley, Osma, Polypipe and Marshall Hunter. (1) £. Top Hepworth Companies in dubai. View options. The entire AquaCell range is fully BBA-approved, with our Core-R unit designed for use in deep applications subject to both regular and heavy traffic loadings, such as cars and HGVs. Download. SEWERAGE, SOIL & DRAIN: ELECTRIC CONDUIT: ASTM -D 1785-94 Sch. 4. uPVC Pipes for Land Drainage & Sewarage SPECIFICATION APPLICATION RATING SIZES BS 5255 Waste Drainage 1 1/4 - 2 inch BS 4514 Soil Drainage 3, 4 & 6 inch BS 4660 Underground Drainage 4 & 6 inch BS 5481 Gravity Sewer Drainage 8, 10, 12 & 16 inch EN 1329 Soil & Waste Drainage 36 - 400 mm EN 1401 Underground Drain Drainage 110 - 400 mm Hepworth Building Products has three specialised divisions: Hepworth Drainage Hepworth Plumbing Products Hepworth Concrete Hepworth Plumbing Products manufacture the market leading Hep20 flexible plumbing system and underfloor heating, above ground plastics including soil, waste and rainwater systems along with Hep30 pressure pipe . Wavin UK is a member of the Wavin Group - the world leader in plastic pipe systems for residential, non-residential and civil engineering projects. £29. edu. Hepworth Plastic Products Materials 01 Identification of. MAECENAS IACULIS. Archived versions of Approved. Brett Martin 450mm Inspection Chamber Base More Options. Free Hepworth Hdpe Catalogue PDF ePub Mobi. co. Hepworth Building Products is a major division of Hepworth PLC, manufacturing vitrified clay and plastic drainage systems. Clark Drain 5 Tonne GPW Recessed Manhole Cover and Frame 580 x 580 x 54mm. Park, Harry Weston Road, Coventry CV3 2TT. 2. Hepworth Clay drainage system comprises a range of perforated and non-perforated vitrified clay pipes supplied complete with factory-fitted push-fit flexible couplings or plain ended with separate couplings to be fitted on site. Once the connector is installed, place the PVC pipe all the way into the other side of the connector. Add to Basket. It is installed to take wastewater from upper floor toilets, baths and sinks into the underground drainage system. Above Ground: BS EN 1329-1: 2000 This standard supersedes BS 4514: 1993 and BS 5255: 1989 Below Ground: BS EN 1401-1: 1998 This standard supersedes BS 4660: 1989 and BS 5481 THE PIPES ARE. Not only is underground drainage a better choice for sanitary reasons, but it removes the need for an unsightly.