AR Brand Gymatic 3/B AR20399 Adjustable Pressure Unloader Valve for RK, RR & XM Series Pumps.
This unloader has 1/2 Male Inlet X 3/8 Male Outlet and a Built-In Adjustable Chemical Injector.
Rated for 3 to 5.5 Gallons Per Minute and up to 3,650 PSI.
Comes complete with mounting bolts
Fits the following AR brand series pumps:
RK, RR & XM Pumps