ST 1500 TRIGGER GUN Suttner Sale! from $51.50 Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. The perennial favorite for general pressure washer applications. PSI: 5000 GPM: 10.4 Temperature: 300°F 3/8" FPT Inlet x 1/4" FPT Outlet Weight: 20.5 oz.