This is an Unloader following Pressure Washer Pump Model:
RMV, RMW and SRMW pumps. RMW2G20 / RMW2G23 / RMW2G24 / RMW2G25 / RMW2.2G20 / RMW2.5G26D-F7 / RMW22G24 / RMW25G25 / RMW25G28 / RMV2G20 / RMV2G24 / RMV2G25 / RMV25G30 / SRMV22G26 / SRMW22G26 / SRMW24G28/ Troy Bilt 200348GS