Enforcer Air Cylinder SeriesCylinder Type- Aluminum tubing with a 16 RMS finish Front Cover- Solid aluminum with oiltight bronze bushing. Delrin seal and 3/8" NPT port Rear Cover- Solid aluminum with mounting hole for 1" clevis pin and 3/8" NPT port Piston Cup- Solid aluminum with Nitrile "O" ring rated at -40 to 185degree F and UHMW polyethylene wear band Temp rating- -40 to 185 degree F Pressure rating- Standard operation pressure 100psi, 10psi minimun to 150psi maximum