Professional Products Aluminum 4-Port Carburetor Fuel Regulator features a four port regulator suitable for two dual inlet carburetors on engines up to 1200 horsepower. It has one 1/2 inch NPT inlet port and four 3/8 inch NPT outlet ports. It flows 150 gallons per hour with 4.5 to 9 PSI adjustability. It has a clear anodized finish.