Track-tested by record setting, professional racers, the Aeromotive Pro Stock Regulator was designed to be used with the Aeromotive A2000 Fuel Pump (P/N 11202) and other drag race style pumps in either single or dual carburetor applications. Utilizing an extremely light weight valve, aluminum bronze seat, and an innovative opposed-spring design, the Pro Stock Regulator is engineered to be the quickest responding, most reliable, highest flowing regulator on the market. PartNumber : aer13208 Description : Pro Stock Regulator; 4-Port Inlet Port Diameter : 3/4 Outlet Port Diameter : 3/8 Port Quantity : 5 Pressure Range : 4-8 Title : Pro Stock Regulator 4-Port California Proposition 65 : WARNING: This product can expose you to chemicals including chromium, which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.p65warnings.ca.gov. Fuel Delivery::Fuel Pressure Regulators