PTFE Square Ring Piston Seal Set, For Bore Dia. 3 in, Seal Material Buna N, Number of Pieces 2, Seal Durometer 58 Shore D, Color Black, Gold, Temp. Range -40 Degrees to 250 Degrees F, Includes (1) Each: PTFE Piston Ring With Nitrile Energizer, 70 Durometer Buna O-Ring