Interstate Pneumatics CH880-KIT 3 piece Industrial Steel Coupler and Plug Kit 1/2 inch Kit Includes: (1) 1/2" Industrial Steel Coupler x 1/2" Female NPT - CH880 (1) 1/2" Industrial Steel Coupler Plug 1/2" Male NPT - CPH881 (1) 1/2 x 1/2 Inch FPT Industrial Steel Coupler Plug - CPH880