Drainage365 stock 25mm, 32mm, 63mm and 90mm barrier pipes from the Puriton brand. Water barrier pipes are MDPE blue water pipes with an inner aluminium core protecting the incoming water supply from any contaminates that might be present in previously contaminated land that has been built on. We also have a range of Puriton water pipe fittings in stock including 25mm, 32mm & 63mm pipe diameters