Aeromotive A4 Carbureted Regulator 13203 - The only four-port regulator on the market that uses a 'soft-seat' design, eliminating pressure creep at idle and, if used, on a throttle stop. Used by many of the best 'Super' class racers in the world. This exclusive design ensures the precise pressure control needed for more consistent E.T.s. Adjustable from 5-15 PSI. Gasoline and alcohol compatible. Standard static flow design, no return line required. (4) ORB-06 outlet ports and 1/8' NPT gauge port. (2) ORB-10 inlet ports for plumbing flexibility.