Adjustable billet fuel pressure regulators designed to handle the demands of the Ford 4.6L, 5.0L and 5.4L engines. Installs easily on the stock factory fuel rail. Adjustable from 30-70 PSI. Fuel pressure rises on a 1:1 ratio when referencing boost. 1/8' NPT gauge port. Stainless steel spring, custom-designed for precise fuel control. Installation kit includes O-rings and gaskets.