Forney 75135 Pressure Washer Accessories, Quick Coupler Plug, 1/4-Inch Female NPT, 5,500 PSI Used in combination with the quick couplers Used anywhere high pressure connections are frequently assembled and disassembled Ideal for quick exchange of spray nozzles and spray guns These quick couplers plugs connect to all of the most common pressure washer equipment in the industry The connect to both male and female fitting in 1/4-Inch and 3/8-Inch sizes