Moeller Marine 033312-10 3/8 in. NPT Brass Three-Way Fuel Shut-Off Valve

The Moeller 033312-10 is a brass three-way shut-off valve built for marine fuel tank plumbing, sized for 3/8 in. NPT connections. As part of Moeller's Brass Shut-Off valve line, it lets a boat owner isolate or redirect fuel flow at the tank, a common need when servicing a fuel line, switching between fuel sources, or shutting off supply for storage and maintenance. The valve body is solid brass for corrosion resistance and long service life in a marine fuel environment, and its three-way design (three ports) provides flow-direction control that a simple two-way shutoff cannot.

Connection ports are 3/8 in. NPT, with an inlet configured as female NPT (FNPT) and an outlet configured as male NPT (MNPT), matching common marine fuel tank and fuel line fittings. The valve is manufactured by Moeller Marine Products, a long-established supplier of marine fuel system components, and is sold as a single unit.

Specifications

• Brand: Moeller
• Manufacturer Part Number: 033312-10
• Valve Type: Three-Way Valve
• Number of Ports: 3
• Thread Size: 3/8 in. NPT
• Inlet Connection: 3/8 in. FNPT (Female)
• Outlet Connection: 3/8 in. MNPT (Male)
• Material: Brass
• Finish: Brass
• Weight: 0.54 pounds
• Item Dimensions: 6 x 4 x 8 inches
• Unit Count: 1

Frequently Asked Questions

What size connections does the Moeller 033312-10 valve have? The Moeller 033312-10 uses 3/8 in. NPT connections, with a female NPT (FNPT) inlet and a male NPT (MNPT) outlet.

Is the 033312-10 valve a two-way or three-way valve? It is a three-way valve with three ports, allowing fuel flow to be directed or shut off between multiple lines rather than just opened or closed like a simple two-way valve.

What material is the 033312-10 fuel valve made from? It is made from brass, chosen for corrosion resistance in a marine fuel system environment.

How much does the Moeller 033312-10 weigh? The valve weighs 0.54 pounds.

What are the dimensions of the 033312-10 valve as packaged? Item dimensions for the Moeller 033312-10 are 6 x 4 x 8 inches.

How many valves come in a package? The Moeller 033312-10 is sold as a single unit, one three-way valve per package.

What is the 033312-10 valve used for on a boat? It is used in marine fuel tank plumbing to shut off or redirect fuel flow, useful when servicing a fuel line, switching fuel sources, or securing fuel supply during storage.

Does the 033312-10 have both NPT thread types, or one? The valve has 3/8 in. NPT threads on both ports, with the inlet threaded female (FNPT) and the outlet threaded male (MNPT).

Is this a genuine Moeller part or an aftermarket copy? The 033312-10 is a genuine Moeller Marine Products valve, manufactured under Moeller's own part number.

Does the 033312-10 differ from Moeller's 1/4 in. NPT valves? Yes, the 033312-10 is the 3/8 in. NPT version in Moeller's Brass Shut-Off valve line, distinct from Moeller's smaller 1/4 in. NPT shut-off valves which use different part numbers.