Overview

The Attwood Marine 88TC06-7 is a portable fuel tank cap with a tether for Attwood portable tanks that use a standard 2 1/4 inch neck. It is EPA-certified, uses a high-flow automatic vacuum valve, and is rated for engines from 0 to 350 HP.

This replacement cap is built for the job a portable tank sees on the water: frequent refueling, tank swaps, trailering, and storage in lockers or under seats where a loose cap is easy to misplace. The tether keeps the cap attached to the tank, and the ratcheting design gives a clear sign that the cap is seated and sealed.

It is specified for Attwood 8803LP, 8806LP, 8812LP, and 8812LLP fuel tanks. For anyone replacing a worn cap or a missing cap on one of those tanks, this is the piece that restores the tank to its intended venting and sealing setup.

Key features

• Fits Attwood portable fuel tanks that use a standard 2 1/4 inch neck.
• Specified for Attwood 8803LP, 8806LP, 8812LP, and 8812LLP tanks.
• High-flow automatic vacuum valve supports fuel demand on engines from 0 to 350 HP.
• Tether keeps the cap attached to the tank during refueling, transport, and routine handling.
• Ratcheting cap helps confirm the cap is fully tightened and properly seated.
• EPA-certified cap for compliant use with portable marine fuel tanks.

Compatibility and fit

This cap is meant for portable topside fuel tanks, not deck fills or built-in fuel systems. The safest fit check is the tank model together with the neck size, especially when replacing an older cap that may have been lost or swapped at some point.

Because it is matched to specific Attwood portable tank models, it suits common small-boat fuel setups where the tank is removed for filling or stored in a cockpit locker, under an aft bench, or alongside an outboard splashwell.

Installation and use

Install it on a clean tank neck and tighten until the ratcheting action indicates the cap is fully closed. Make sure the tether is not twisted or trapped under the cap, and keep the sealing area free of grit and fuel residue so the cap can seat the way it should.

On portable tanks, a cap does more than cover the opening. It also affects how the tank vents and feeds fuel, so replacing a damaged cap with the correct style matters for both everyday use and storage between trips.

Use on board

This cap makes sense for boats that run portable fuel tanks for a main small outboard or a kicker, especially where tanks are moved often between dock, vehicle, and boat. It also suits owners who want the cap to stay attached during refueling and tank handling instead of ending up loose in the cockpit or overboard.