Piston Crown Seal, Seal Type Crown, Seal Material Urethane, For Bore Dia. 2 1/2 in, Seal Durometer 95 Shore A, Shell Durometer 95 Shore A, Temp. Range -35 Degrees to 220 Degrees F, For Groove Width 0.28 in, For Piston Groove Dia. 2.125 in, Max. Speed 3.0 fps, Max. Pressure 5,000 psi, Inside Dia. 2 1/8 in, Outside Dia. 2 1/2 in, Width 3/16 in, Height 3/16 in, Color Black