Attwood Marine Deck Fills

Attwood Marine Deck Fills: Engineered for Safety, Built for the Water

When it comes to safely transferring fuel, water, or waste aboard your vessel, few components are more critical — or more overlooked — than the deck fill. Attwood Marine, a brand with over 100 years of marine engineering heritage, has made deck fills a centerpiece of its integrated fuel systems lineup. These aren't just ports in your hull; they're precision-engineered safety components designed to protect your boat, your passengers, and the environment.

A Legacy of Marine Fuel System Innovation

Founded in 1893, Attwood has spent more than a century refining what it means to build reliable marine hardware. That institutional knowledge is evident in their deck fills, which are tested and certified against some of the most rigorous standards in the industry — including ABYC, U.S. Coast Guard (USCG), EPA diurnal emission standards, and international CE/ISO 10088 certifications. This level of compliance isn't accidental; it reflects Attwood's commitment to engineering products that perform in the real world.

Pressure Relief System Deck Fills

One of Attwood's most technically advanced deck fill offerings is their Pressure Relief System series. These fills feature automatic diurnal emission control and overpressure relief safety valves built directly into the cap. Triple high-flow vacuum valves ensure superior make-up airflow, keeping high-horsepower engines fed without restriction. The system supports flow rates of 4–18 gallons per minute during refueling when used with compatible Attwood components, and the integrated nozzle retention mechanism with a built-in flame and spark arrestor is designed and tested to prevent water from entering the fuel system. These fills are also compatible with Jerry Can and standard marine nozzle refueling.

Oval Vented Deck Fills with Patent-Pending Waterproof Screen

Attwood's oval vented deck fill line introduces a patent-pending waterproof screen — an industry first — that eliminates the possibility of water infiltrating your boat's fuel system while still allowing the engine to breathe freely. The unique design incorporates an integral tank vent with a flame arrestor and anti-surge technology that prevents fuel from escaping into the environment. These fills exceed ISO 10088 minimum venting area requirements and meet all ABYC and USCG safety standards for marine fuel systems.

Materials and Configuration Options

Attwood offers a broad selection of deck fills across multiple materials and body configurations to suit virtually any vessel or budget. Options include:

• 316 Stainless Steel – Highly polished finish with a flush, O-ring-sealed cap for a watertight, corrosion-resistant solution ideal for saltwater environments
• Chrome/Zamak alloy – A mid-range option balancing aesthetics and durability
• Plastic (scalloped black cap) – Lightweight and cost-effective for freshwater or budget-conscious builds
• Straight and angled body configurations – For flexible installation in tight or angled hull sections

Caps are color-coded and imprinted with ISO symbols for Gasoline, Diesel, Water, and Waste, reducing the risk of mis-fueling. Each fill includes a stainless steel beaded chain to prevent cap loss, and a deck plate key for secure closure.

Why Choose Attwood Deck Fills?

Whether you're replacing a worn fill on an aging cruiser or speccing out a new build, Attwood's deck fills deliver the combination of safety certification, material quality, and installation flexibility that serious boaters demand. Their compatibility with ethanol-blended fuels and broad support for standard 1-1/2" fill hose sizes make them a versatile, future-ready choice for almost any marine application.