AR20821 Mini-Matic 4/B Unloader - 5 GPM, 2600 PSI, 140°F

AR20821 Mini-Matic 4/B unloader valve. Bolt-on design eliminates external bypass hose and fittings. Features brass body with stainless steel plunger and spring, and built-in aluminum bypass. Includes molded plastic adjusting knob. Does not include chemical injector. Rated for 5 GPM, 2600 PSI, and 140°F. Inlet: 1/2" FPT. Outlet: 3/8" MPT. Compatible with AR RC, XT, and XM Series pumps. Cross-ref: 8.712-564.0, 462228, 87125640.