Upgrade your boat, yacht, or caravan fuel system with this sturdy 316 stainless steel deck fill. It has a 2-inch (50mm) opening and is made from corrosion-resistant AISI 316 stainless steel using a lost-wax casting process, then polished to a mirror-like finish. The cap is keyless for convenience – just lift the built-in tab and turn to open or close. It includes a high-grade O-ring seal to prevent leaks and a stainless steel retaining chain so you won’t lose the cap overboard. The overall height is about 3.19 inches (81mm), and the top plate diameter is 80mm (3.15 inches) with a pull-out lug for easy unscrewing. The fastener holes are 6mm in diameter for secure mounting. This deck fill is designed for diesel fuel and is built to withstand harsh marine environments without rusting. A professional-looking, durable addition to your vessel's deck hardware.