Designed to be used with Aeromotive HP marine fuel pumps these Aeromotive HP marine EFI fuel pressure regulators provide full pressure adjustments from 40-70 PSI, plus a 1:1 boost/vacuum reference. These marine regulators are CNC machined from 6061-T651 billet aluminum alloy with stainless steel hardware and handsomely finished with a type III hard-coat anodized exterior.