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Marine fuel cap boats made of stainless steel could provide a sealing property for outdoor use and would not penetrate water into the storage space of the deck. If you want to fill, you can use the key to insert and rotate the hole, and then easily remove the fuel cap. With a stainless steel retaining chain, it could avoid losing or laying the cap. Tank filler for deck fittings made of 316 stainless steel, it could ensure that it is corrosion resistant and abrasion resistant. The stainless steel filling nozzle boat of the deck made of SUS316 ensures a longer service life of your outdoor activities. These are corrosion resistance and durability in various applications, especially in the saltwater environment. Whether indoors or outdoors, stainless steel material and polished surface to protect it from rust. The surface of the stainless steel boat fuel cap is highly polished. The deck filler hardware has been professionally tested for airtightness, and it will also be allowed to not leak fuel or water. It can be used on boats, yachts, caravans, motorhomes, trucks, tractors, trailer tanks, etc.