Double stem seals are generally used for high head, exceeding 30Mtrs. Double stem seals can be used as Top or Side rubber seal, sometimes as Bottom rubber seal too. Rubber Concept specializes in PTFE (Teflon) cladding over bulb portion of Double stem rubber seal. PTFE cladding helps rubber seal to retain its flexibility while maintaining its position between the clamp bar and seal plate, thus improving durability and life.
