Uniweld 40050 Rubber Plug Adaptor, 1/2-Inch Rubber Plug Adaptor, 1/2" x 3/4" Tapered Cone with " Male Flare Fitting Blow out copper lines, aluminum tubing, hoses and condensate drain line with the use of Nitrogen, Air, CO2 or water Attaches to Uniweld Part No H2SSM 2-Feet Service Hose or Part No H5SMY 5-Feet Service Hose