Interstate Pneumatics CPA880 1/2 Inch Automotive Steel Coupler Plug 1/2 Inch Female NPT 1/2 inch Automotive Steel Coupler Plug x 1/2 inch Female NPT Body: Forged tool steel, heat treated and zinc plated Plug Body: 1/2 inch Type: Automotive (Tru-Flate) Threads: 1/2 inch NPT Female