Hep2O® Adaptor - Male BSP TO PLASTIC Spigot - 22mm x 3/4" - 243322 The Hep2O® push-fit flexible plumbing system from Hepworth Building Products is backed by a fifty year guarantee and offers a comprehensive range of pipes and fittings in 10, 15, 22 and 28mm nominal diameters for domestic water supply and heating applications.