Deck Fills & Filler Caps
Everything for secure filling of fuel, water, and waste tanks
A reliable filler cap is essential for keeping your onboard tanks safely sealed and leak-free. In our primary Deck Fills & Filler Caps category, you will find a wide selection of deck fills, tank caps, and filler keys for any vessel. Whether replacing a cap for your diesel, gasoline, freshwater, or holding tank, a proper seal prevents leaks, foul odors, and contamination from water or dirt.
Stainless steel, composite, and labeled deck fills
Our collection features deck fills in various high-grade materials to match your deck hardware:
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Stainless steel (AISI 316) fills: Offers superior corrosion resistance and a sleek finish on deck.
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Plastic & composite fills: Lightweight, UV-stabilized, and durable for everyday marine use.
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Labeled caps: Clearly marked with international symbols or text (such as WATER, FUEL, DIESEL, GAS, or WASTE) to avoid costly fueling mistakes.
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Deck keys & retaining chains: Universal deck fill keys and built-in retaining chains to prevent caps from dropping overboard.
Safe fueling and hose connections
Deck fills must provide an airtight seal using quality O-rings while matching your hose diameter. Select the correct hose barb size (e.g., 38 mm or 50 mm) and consider integrated tank vents or grounding screws for fuel applications to dissipate static electricity.
Explore our complete selection of deck fills and filler caps online at Marine-Outlet.
