Boat Deck Fill/Filler Keyless Cap -1 1/2"- Gas - Fuel - Diesel - Waste -Water Marine 316 Stainless Steel Convenient, keyless design - lift tab on cap and turn to open or close. Precision cast 316 marine grade stainless steel. Maximum corrosion resistance and durability in the saltwater environment. Polished to a beautiful, mirror-like finish. Labeled Fuel. Sold per 1 each. See additional details in product description below.