Fast Response,Low MaintenanceFeatures & SpecsCartridge design provides the most stable fuel delivery platform2 or 4-port configurationAnodized, machined billet aluminumAdjustable base pressure with precise pressure control4 to 12 psi1/8" NPT gauge portDurable metal-to-metal seat Heat-treated stainless steel adjustment springLightweight spring cup with nitrile-infused fabric diaphragmSuitable for drag racing, circle track, road racing, mud bog, power boats, and tractor pullingBoost Reference models have 1:1 compensation ratio