Interstate Pneumatics CL440B 1/4" Lincoln Series Coupler 1/4" Female NPT (Brass) 1/4 inch Lincoln Series Brass Coupler x 1/4 inch Female NPT NPT size: 1/4 inch NPT Female Temperature: -40 degree F to 212 degree F Seals: Buna-N (Nitrile) Ball Bearing: Quantity 6, stainless steel