Interstate Pneumatics CH881 1/2" Industrial Steel Coupler x 1/2" Male NPT 1/2 inch Industrial Steel Coupler x 1/2 inch Male NPT NPT size: 1/2 inch NPT Male Temperature: -40 degree F to 212 degree F Seals: Buna-N (Nitrile) Ball Bearing: Quantity 6, stainless steel