Silicone grease lubricates rubbers, plastics and other materials, and also combinations of these with metals. It will seal and protect rubber ‘O’ rings, for example in the assembly of PVC pipes. Complies with UK water fittings bylaws. HT silicone grease (high tack) is for use where severe conditions of temperature and pressure require durability without the grease being too stiff to handle. For use on ‘O’ rings, valves and taps; ideal as plumbers’ grease.