Uniseal Wholesale Du Pont Alcryn Rubber Pipe to Tank Container Sealer Bulkhead Fitting (12 Count, 3/4" Seal) Known as the world's best seal, and easy to install Made with Du Pont Alcryn for a liquid-tight seal In static conditions the seal is good up to 65 PSI Withstands pressure, suction, acids, oils, greases, gasoline, sewage, waste, heat and cold