The hardware pictured is a 316 stainless steel flush-mount deck fill designed for marine vessels. While the top flange in this specific image is stamped "WASTE" for holding tank pump-outs, the exact same structural design is used for marine fuel fills (stamped "GAS" or "DIESEL") and water fills (stamped "WATER") to meet Coast Guard compliance and prevent dangerous cross-contamination.
Functional Details & Features
• Deck Plate Key: The small, two-pronged tool included at the bottom left is the deck plate key. The prongs fit into the two dimples on the cap, giving you the necessary leverage to break the seal and unscrew a cap tightened by salt crust or tight O-rings.
• Cap Slots: The cap features both a wide straight slot (for a large flat coin, winch handle, or screwdriver) and dual pinholes, offering multiple ways to open it.
• Watertight O-Ring: The cap is fitted with a rubber O-ring seal to prevent deck water from contaminating your fuel or holding tank.
• Retaining Chain: Inside the barrel, a small stainless steel chain links the cap to the housing body so the cap cannot accidentally drop overboard into the water during fueling.
Common Applications by Type
• FUEL / GAS: Intended for gasoline lines, typically paired with a built-in internal safety retention chain and an oil-resistant rubber O-ring seal to stop fumes and water intrusion.
• DIESEL: Used specifically for diesel lines to keep fuel ports safely color/text-coded across multi-tank deck configurations.
• WATER / WASTE: Utilized for fresh water tanks or waste holding tank suction fittings.
If you are planning to install or replace a fuel deck fill, let me know:
• Are you running gasoline or diesel? (Fuel fills require specific labeling and safety grounding to prevent static sparks).
• What is the inside diameter of your fuel fill hose?
• Do you need help with USCG grounding regulations or choosing the right marine bedding sealant?
We can provide the exact installation steps or wiring requirements for your project.
Haifan Rigging supply a range of marine boat hardwares. They come with a variety of fittings for each end to suit your particular application. Yachts, Sailboats, Ships and Other Fields.
If you wish to ask a question or need further advice, you are welcome to contact us. We'll be happy to help.
We look forward to hearing from you!
