Marine hinges use 316 stainless steel and precision casting，corrosion resistant and more durable under seawater environment Our Boat deck filler neck has retaining chain, to avoid losing or misplacing cap Deck Filler Tank tube has lift built-in tab on cap you could easy open or close Widely used for maritime, beach, garden, pool, coastal decorations About us: We have our own factory thay you could enjoy nice service and quality