Amazon.com: STYDDI Pressure Washer Quick Connect Kit for Sun Joe SPX Series, M22 15mm to 3/8 Inch Quick Hose Connect Fitting Coupler Compatible with Sunjoe, Campbell, MI-T-M, Stanley Pressure Washer, 4 Pieces :
Karcher Universal Garden Hose Connector for Electric Pressure Washers, Steel, 1/4-Inch Fitting, Compatible with Multiple Brands in the Pressure Washer Parts department at Lowes.com
M22 Adapter High Pressure Washer Hose Adapter Pressure Pipe Quick Connector Converter Fitting For K Series Pressure Washer