SurfaceMaxx M22 Threaded x 1/4-in Quick Connect Set in the Pressure Washer Parts department at Lowes.com
Amazon.com: Vortxx Pressure Washer Quick Connect Adapter Set for Sun Joe SPX Series, M22-15mm to 3/8" Quick Release, 5000 PSI, Complete Hassle-Free Set : Patio, Lawn & Garden