This AR North America Pressure Washer Pump, Triplex, 4.0 GPM@4000 PSI (RRV4G40D-F24) includes an external plumbed bypass unloader, a thermal relief valve, and male quick connect. This pump is completly rebuildable from the valves to the packings and unloader. These new pumps feature a new rod design, large side cover sight glass, ceramic plungers, high quality high-pressure seals, new, low-pressure seal with scraper (patented), two piece plunger guides, forged brass high efficiency head design and new styling. It will fit most horizontal shaft engines with a 1" diameter shaft. The pump bolts to the motor with a 4 bolt pattern and bolts up on 8 to 13 horsepower Honda Motors. This pump is a perfect replacement for pump models RSV4G40 and RKV4G40, as well as Karcher 9.120-019.0.