Amazon.com: M MINGLE Pressure Washer Gun Adapter, to 1/4'' Quick Connect Fitting, Only Compatible Karcher K2, K3, K4, K5, K6, K7 : Patio, Lawn & Garden
Adapter For Karcher HD High Pressure Washer Connect Between New And Old Style For Karcher Washer Gun And Pipe - AliExpress
Karcher Universal Garden Hose Connector for Karcher Electric Pressure Washers, Steel, 1/4-Inch Fitting, Multi-Purpose Adapter in the Pressure Washer Parts department at Lowes.com