Interstate Pneumatics CA460B 1/4 Inch Automotive Brass Coupler 3/8 Inch Female NPT 1/4 inch Automotive Brass Coupler x 3/8 inch Female NPT NPT size: 3/8 inch NPT Female Temperature: -40 degree F to 212 degree F Seals: Buna-N (Nitrile) Ball Bearing: Quantity 6, stainless steel