PRESSURE WASHER PUMP PARTS -SIMPSON/DELCO REPLACEMENT UNLOADER RETRO FIT KIT
How a pressure washer unloader valve works (with cut-away view) - YouTube
Amazon.com: Himore Unloader Valve for Pressure Washer Pumps 309515003, 308418003 - Does NOT Replace Part Number 190628GS, Only Way to Verify Fitment is to Measure Total Length, See Spec Pictures : Patio,