The Type 567 is a wafer style butterfly valve rated for pressures up to 150 psi and temperatures of up to 140° F for PVC and 176° F for CPVC, also available in polypropylene and PVDF. Better chemical compatibility is achieved because the inner body is the same material as the piping. The Type 567/578 Butterfly valves have a unique eccentric design that means the disc is not in contact with the seal in the open position. The result is less wear and operating torques half that of previous models. Georg Fischer double eccentric butterfly valves require approximately 50% less operating torque than boot-style competitive valves. Lever and gear operators are both available. In the lever version, the opening angle is clearly indicated on the index plate.