Holley 12-840 Carb Fuel Pressure Regulator — 4.5–9 PSI shears these Y adapters ensure leak-free

these Y adapters ensure leak-free operation and consistent flow where it matters most

Whether you’re tackling a full build or a simple repair

ventilate the work area

or regulators

Holley 12-840 Carb Fuel Pressure Regulator — 4.5–9 PSI shears these Y adapters ensure leak-freeHolley 12 840 Carb Fuel Pressure Regulator 4. 59 PSI Dial in steady carbureted fuel pressure with a compact, billet regulator. Adjustable 4. 59 PSI, non return (dead head) design, with one inlet and dual outlets for easy split feeds. Includes a 1 8" NPT gauge port and mounting bracket. Why builders choose this regulator Carb perfect range: adjustable 4. 59 PSI for street strip carb setups. Simple plumbing: no return line needed; one 3 8" NPT inlet