Interstate Pneumatics CPH443 1/4 Inch Industrial Steel Coupler Plug 1/4 Inch Barb NPT 1/4 inch Industrial Steel Coupler Plug x 1/4 inch Barb Body: Forged tool steel, heat treated and zinc plated Plug Body: 1/4 inch Type: Industrial (Hansen or Milton type) Barb: 1/4 inch