These Aeromotive double adjustable carbureted regulators are designed for use with Aeromotive's series of mechanical drive fuel pumps. These regulators allow a dual pressure strategy often required for alcohol carbureted racing engines where fuel pressure must be lower at idle, but higher as rpm and loads increase. Aeromotive double adjustable carbureted regulators prevent flooding during low fuel demands, while eliminating starvation at high fuel demands. They are capable of supporting 2,000+ hp, alcohol-burning engines. These regulators do not require jets, pills, logs, or barrel valves.