Accumulator Repair Kit Operating Temp Range -20 to 165 Degrees F for Oil 32 to 165 Degrees F for Water and Water-Glycol Compatible With Accumulator Type Piston For Use With 4WB51 4WB54 4WB57 Includes (2) End Cap O-Rings with (2) Back-up Washers (2) PTFE Rings and Gas Valve O-Ring Buna V-O-Ring Piston Seals with (2) Back-up Washers