... specifications, including five series of patent products. They are flexible rubber joints, reduced rubber joints, rubber elbows, fan ... valve rubber, rubber filter, rubber compensator air flue compensator, flexible hanger, rubber shock pad, shock absorber, pipe damper, seal ... 401503204727534026527536026550200375197338420325338450325502504752474005204254005604257530056EPDM Rubber Back Valve