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The Byelaw 30 Fittings Kit For Expansion Tanks consists of a set of components designed to protect the water in a cistern from contamination. They are intended for mains fed cold water storage cisterns and feed and expansion cisterns.The included screened overflow pipe is designed to prevent anything outside from entering the cistern, which is great for keeping out insects and external debris, keeping your system clean and protected. While the overflow dip tube allows the overflow pipe to dip into the water so that cold drafts cannot enter the cistern. The kit also includes a rubber grommet that creates a sealed admission point for the expansion/vent pipe, as well as a breather fitted in to the lid to prevent the formation of condensation inside the cistern and keep it at atmospheric pressure.Features & Benefits: Byelaw 30 Fittings Kit For Expansion Tanks, Protect the water in a cistern from contamination, Complete kit, Enables cold water storage tanks to comply with the provisions of Byelaw 30Kit Contents, Screened Overflow Pipe, Overflow Dip Tube, Rubber Grommet, Breather Fitting. Byelaw 30 Fittings Kit For Expansion Tanks Polytank EK201