Moeller Brass Anti-Siphon Valve, 3/8 In. Barb x 1/4 In. NPT, 30 Calibration, Part 033801-10

The Moeller 033801-10 is a brass anti-siphon valve built for permanent marine fuel tank installations. It combines anti-siphon protection with a hose barb connection, sealing the fuel line so fuel cannot siphon out of the tank if the line is cut or disconnected below the fuel level. Federal law requires anti-siphon protection on permanent fuel tank installations where the hose dips below the top of the tank, making a valve like this a required safety component rather than an optional accessory.

This valve is configured with a 3/8 inch hose barb on one end and a 1/4 inch NPT threaded connection on the other, with a 30 calibration rating. It installs inline between the fuel tank outlet and the fuel line, and is sized to match Moeller's broader anti-siphon valve lineup, which is offered in multiple barb and thread combinations so boat owners can match the exact port and hose size on their tank.

Specifications

• Brand: Moeller
• Manufacturer Part Number: 033801-10
• Product Type: Anti-Siphon Valve
• Material: Brass
• Barb Size: 3/8 inch
• Thread Size: 1/4 inch NPT
• Thread Type: NPT
• Calibration: 30
• Connector Type: Barb
• Item Dimensions: 6 x 2.5 x 1.25 inches
• Weight: 0.1 pounds
• UPC: 739729338018

Fitment

Universal fit for permanent marine fuel tank installations using a 3/8 inch barb to 1/4 inch NPT connection; confirm your tank's port thread and hose size before ordering.

Frequently Asked Questions

What is the Moeller 033801-10 used for? The Moeller 033801-10 is a brass anti-siphon valve installed inline on a permanent marine fuel tank to prevent fuel from siphoning out of the tank if the fuel line is cut or disconnected below the fuel level.

Is anti-siphon protection legally required on my boat? Federal law requires anti-siphon protection on permanent fuel tank installations where the fuel hose dips below the top of the tank, which is the exact condition the 033801-10 valve is designed to address.

What size hose and fitting does part 033801-10 use? This valve has a 3/8 inch hose barb on one end and a 1/4 inch NPT threaded connection on the other, with a 30 calibration rating.

What material is the 033801-10 anti-siphon valve made of? The 033801-10 is made of brass.

How much does the 033801-10 anti-siphon valve weigh? It weighs 0.1 pounds.

What are the dimensions of the 033801-10 valve? The item measures 6 x 2.5 x 1.25 inches.

Does Moeller make this anti-siphon valve in other barb and thread sizes? Yes, Moeller offers this style of anti-siphon valve in several barb and thread combinations, so the 033801-10's 3/8 inch barb by 1/4 inch NPT configuration should be matched against your tank's actual port and hose size before ordering.

Can the 033801-10 be used on a non-permanent or portable fuel tank? The 033801-10 anti-siphon valve is intended for permanent fuel tank installations, which is the installation type federal anti-siphon requirements apply to.

What calibration rating does the 033801-10 have? The 033801-10 has a 30 calibration rating.

Is the 033801-10 a genuine Moeller part? Yes, part number 033801-10 is a genuine Moeller Marine anti-siphon valve, not an aftermarket equivalent.

How does an anti-siphon valve like the 033801-10 work? It combines a check-valve style anti-siphon mechanism with a hose barb fitting, sealing the line so fuel cannot flow backward out of the tank if the fuel hose is compromised below the fuel level.

What connection type does the 033801-10 have on the tank side? The 033801-10 connects to the tank side using a 1/4 inch NPT thread, with a 3/8 inch barb on the hose side.