Boat owners, this RiaYer diesel deck fill is a solid upgrade for your vessel's fueling system. Made from marine-grade 316 stainless steel, it's built to resist corrosion, rust, and saltwater damage – so it'll last for years even in tough conditions. The whole unit is hand mirror-polished, giving it a sleek, shiny look that's also easy to clean. Security is a big plus here: the cap is key-operated, which means only you can access your fuel, and it comes with two stainless steel keys (plus a spare chain so you don't lose the cap overboard). The cap has a clear \DIESEL\ marking to prevent misfueling, and it seals tightly with an O-ring and rubber gasket to keep water out and fuel vapors in. The straight design fits 1-1/2 inch (38mm) fuel hoses and installs flush with your deck for a clean, low-profile appearance. It's not just for boats – you can use it on yachts, RVs, pontoon boats, trucks, tractors, and other outdoor fueling setups. Approximate dimensions: flange diameter about 2.88 inches, overall height around 3.32 inches. Installation is straightforward, and once it's on, you get reliable, leak-proof performance every time you fuel up. If you want durability, security, and a professional look for your marine or RV fuel system, this deck fill is a top choice.