Moeller Marine 033421-10 Fuel Tank Connector, 3/8 in Male Bayonet Style, Mercury

The Moeller Marine 033421-10 is a male fuel tank connector built in the bayonet style used on Mercury portable fuel tank fittings. It attaches to 3/8 inch inside diameter fuel hose and forms the male half of the quick-connect coupling that joins the fuel line to the tank, letting the line be disconnected without tools when the tank is stowed or swapped out. The bayonet design locks the male and female halves together with a simple twist-and-lock action, giving a secure, leak-resistant seal at the tank end of the fuel system.

Built from plastic, the connector is sized for standard 3/8 inch ID fuel hose, matching the barb to the hose so a properly tightened hose clamp holds a tight connection. It ships as a single connector, ready to be paired with the corresponding female tank fitting and hose clamp to complete the connection. Because it is a genuine Moeller part identified by number 033421-10, it is built to the same dimensions and bayonet geometry as the original fitting it is replacing, so it drops into a Mercury-style fuel line setup without modification.

This connector is a straightforward, low-cost way to restore a worn, cracked, or leaking fuel tank connection on a boat using a Mercury-pattern bayonet fitting, keeping the fuel system sealed and functioning as designed.

Specifications

• Brand: Moeller
• Manufacturer Part Number: 033421-10
• Connector Type: Male fuel tank connector
• Style: Bayonet style
• Hose Fitting Size (ID): 3/8 inch
• Fitment: Mercury
• Material: Plastic
• Package Dimensions: 6.9 x 1.7 x 1.3 inches
• Weight: 0.1 pounds
• UPC: 739729421109
• Quantity: 1 connector

Fitment

Designed for Mercury bayonet-style fuel tank connections using 3/8 inch ID fuel hose.

Frequently Asked Questions

What is the Moeller 033421-10 used for? The Moeller 033421-10 is a male fuel tank connector that joins a 3/8 inch ID fuel hose to a Mercury bayonet-style fuel tank fitting, allowing the fuel line to be connected and disconnected at the tank.

What hose size does this connector fit? It is sized for fuel hose with a 3/8 inch inside diameter, secured to the barb end with a hose clamp.

Is the 033421-10 a male or female fitting? It is the male half of the bayonet-style connector pair; a matching female fitting is required on the opposite side of the connection.

Does this connector work with Mercury fuel tanks? Yes, the 033421-10 is built for Mercury bayonet-style fuel tank connections.

What material is the Moeller 033421-10 made from? This connector is made from plastic.

How much does the 033421-10 weigh? The Moeller 033421-10 weighs 0.1 pounds.

What are the package dimensions of this part? As packaged, the 033421-10 measures 6.9 x 1.7 x 1.3 inches.

How does the bayonet style connection work? A bayonet-style fitting like the 033421-10 joins to its matching female half with a twist-and-lock motion rather than a screw thread, giving a quick, secure fuel line disconnect at the tank.

Is this a genuine Moeller part? Yes, the 033421-10 is a genuine Moeller Marine part identified by that part number.

How many connectors are included? Each 033421-10 order includes one male tank connector.

Do I need a hose clamp to install this connector? Yes, a hose clamp is used to secure the 3/8 inch fuel hose onto the barb end of the 033421-10 once it is slid on.