Adjustable Billet By-Pass Regulator-3/8" NPT 12-879
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Features:
- Adjustable from 4-65 psi for precise fuel pressure adjustments
- Constructed of billet aluminum with a black anodized base and a clear anodized top for good looks
- Used in systems with a return line back to the tank
- (1) 3/8Ó NPT Inlet; (1) 3/8Ó NPT Outlet; and (1) 3/8Ó NPT Return Port
- Includes fitting for manifold reference
- Includes an 1/8 NPT gauge port
- Boost Reference - 1:1
- The 4-15 psi carbureted spring comes installed in the regulator
- Compatible with diesel fuel and E85
About Holley

Holley Performance Brands is the undisputed leader in carburetors, fuel pumps, fuel injection, intake manifolds, fuel injection, and fuel systems.
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