Uses in Static applications and in Dynamic applications such as Pump Shafts and Hydraulic Cylinder Pistons where there is relative motion between parts and the o-ring. Are used on Automotive and Industrial machinery components, electronic instruments, electrical applicances, washroom facilities, faucets, etc. Our engineered o-ring compounds are designed to perform in a wide range of applications with varying chemical exposures, pressures and temperatures. Also replacement for American 570078 Commander Center Rod O-ring and Hayward Center Rod O-ring. Waterway 805-0206 Crystal Water De Filter Slide Valve Top Mount O-ring. Baker Hydro Newport Valve Shaft O-ring, American 570078 Commander Center Rod O-ring . Inner Diameter: 557.61mm, Outer Diameter: 568.27mm, Width: 5.33mm