Weldon bypass regulator for fuel injected applications up to 120psi. A2040 Series, Bypass Regulator. Bypass Regulator USCG Certified for marine use! Size of Return Orifice in Inches. Fully adjustable from 4-200 psi. Hardened steel ball and replaceable steel seat. Compatible with most racing fuels including ethanol, and methanol. 1/8 NPT Gauge Port. 1/8 NPT manifold pressure reference port. Fuel pressure increases on a 1:1 ratio with boost. Two -10 pressure ports. Replaceable / interchangable internal components. For use with all Weldon Pumps as well as pumps from other manufacturers. Mil-Spec clear anodized cover.