Interstate Pneumatics CH880 1/2" Industrial Steel Coupler x 1/2" Female NPT Body: Steel, Zinc plated,Spring: Stainless Steel NPT size: 1/2 inch NPT Female,Ball Bearing: Quantity 6, stainless steel Temperature: -40 degree F to 212 degree F Type: Industrial Seals: Buna-N (Nitrile)