Hose Connector for Water/Fuel Tank – Ø10/12 mm Barb Fitting

This tank connector with an Ø10/12 mm hose barb allows you to easily add a hose outlet to any water or fuel tank. The kit includes the plastic barb fitting itself, a flat sealing washer, and a backnut – a classic bulkhead-style design that installs through a hole in the tank wall. The barb (external portion) is approximately 11 mm in diameter, which perfectly suits flexible hoses with 10 to 12 mm inner diameter.

Installation: Drill a clean hole in the tank wall of the appropriate size, insert the threaded part of the connector from the outside (with the rubber gasket between the fitting’s flange and the tank wall). From the inside, screw on the locking nut. Tighten by hand (or gently with a tool) until the gasket compresses and the connection is watertight. Once mounted, you can slide your hose onto the external barb and secure it with a clamp. The result is a reliable outlet/inlet without needing additional screws or adhesives on the tank.

Applications:

• In fuel systems, this Ø10/12 mm connector is ideal for small to medium tanks – for example, portable fuel tanks for outboard engines, ATV/generator fuel cells, or built-in boat tanks for engines up to ~150 HP where the fuel feed is via ~10 mm hose. It provides a stable fuel feed to the engine without drawing air, and stands up to engine vibration and exposure to fuel.
• In freshwater systems, the fitting works great as a connection between a water tank (or accumulator) and a water pump/faucet. The 10–12 mm size is common in camper and boat pump systems for supplying sinks, showers, etc. The connector ensures a tight seal so precious water doesn’t leak into the bilge or vehicle interior.
• It can also be used for vent lines on tanks – for instance, as a barb to attach an air hose (same ~10–12 mm size) that vents fuel vapors overboard or lets air into a water tank when draining.

The connector is made of a special plastic that is fuel and oil safe, so it won’t crack or degrade upon contact with gasoline or diesel. It’s also UV-resistant, important if the tank is exposed to sunlight (such as in an open boat or roof-mounted RV tank). This means the connection will remain robust and leak-free for years.

By adding this Ø10/12 mm connector to your tank, you create a professional-grade hose outlet similar to factory solutions. It improves your tank’s functionality and makes system maintenance easier – hoses can be connected and disconnected easily as needed, with no jury-rigging. It’s a simple upgrade that greatly enhances the reliability and serviceability of your fuel or water setup.