Aeromotive Marine Carbureted Adjustable Regulator 3/8" NPT 13215 - Specifically designed for carbureted marine engines, these adjustable regulators offer higher flow, quicker response and less pressure creep than competing two-port designs. Adjustable from 5-12 PSI. Provides 3/8' NPT inlet and outlet ports. 1/8' NPT gauge port included Regulators re-seat after the needle shuts down, preventing pressure creep.