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GENUINE KARCHER CONTROL HEAD 90013610 K3 K4. SEE LIST TO SEE IF THIS FITS | eBay
Karcher K3 K4 Pressure Washer Control Head Housing Kit 9.002-010.0 /90020100 | eBay
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1/4 Inch Quick Releasure Blue Connector To Karcher K2 K3 K4 K5 K6 K7 Pressure Washer Spraying Nozzles Adapter - Water Gun & Snow Foam Lance - AliExpress