Overview

The Attwood Marine 99201GS1 is a vented gas deck fill with a round cap, an angled plastic neck, and hose connections for 1-1/2 in. fuel fill hose and 5/8 in. vent hose. It uses a cap made from stainless steel at deck level and an integrated vent arrangement inside the fill body.

This part is marked for gasoline service and uses a built-in vent path rather than relying on a separate deck vent fitting. For replacement work, the round cap measures 85 mm, with a 54 mm neck cutout and a 20 mm vent cutout. Installation uses four #8 screws.

This version belongs to Attwood's international gasoline deck fill range and is not for U.S. or Canada gasoline applications. That matters when you are matching it to the boat's fuel-system layout and local compliance requirements.

Key features

• Fits standard 1-1/2 in. fuel fill hose and 5/8 in. vent hose.
• Angled neck helps where the hose run below deck does not line up straight under the fill point.
• Waterproof screen in the vent path blocks water from entering through the fill while the tank continues to vent.
• Integral vent includes a flame arrestor and anti-surge feature inside the fill assembly.
• Round gasoline cap uses the fuel symbol on top and includes a beaded retaining chain and deck plate key.

Compatibility and fit

This deck fill suits boats already rigged for 38 mm fill hose and 16 mm vent hose, especially when the original hardware used a round fill with the vent built into the filler body. It is a practical match for replacement work on runabouts, center consoles, small cruisers, and sailboats that carry gasoline and need an angled hose entry below deck.

Before ordering, check the hose sizes, the deck opening, the screw pattern, and the clearance needed for the angled neck and vent connection. On boats with tight access under side decks or coamings, the angled body can make hose routing easier than a straight fill.

Installation and setup

Because the vent is part of the deck fill, the hose layout below deck needs to stay clean and unrestricted. The fill hose should run to the tank without a sharp pinch point, and the vent hose needs enough rise and space to avoid slow fueling or splash-back at the nozzle.

The round cap format keeps the top-side footprint familiar for many replacement jobs, while the stainless cap gives you a hard wearing surface at the deck. If you are replacing an older fill, it is worth checking that the cap can open freely and that the retaining chain has room to hang clear when fueling.