Clay Drainage and Repair Couplings Complete range of Clay Drainage. Pipes 100mm to 300mm, Fittings, Channels, Access Chambers and Accessories. Read more Concrete Drainage Manhole and Soakaway Rings, Cover Slabs and Ancillary Products Concrete Inspection Chambers and Cover Slabs Read more Underground Drainage A major stockist of Polypipe Underground Drainage inc pipes, bends, fittings, inspection chambers and accessories. Read more Surface Water Drainage Ridgidrain 150mm to 450mm diameter twin-wall pipes, couplings, seals and fittings. Read more