Feature:1. Material: Selected ABS engineering plastics, the boat water filler is corrosion resistant, anti rust, and durable.2. Sign: The surface is frosted and marked with the word "water" to distinguish it from the use of oil.3. Anti Lost: The body and the cover are connected by a chain, which effectively prevents the cover from being lost during use.4. Easy to Use: Convenient keyless design, just lift the built in tab on the cap and turn to open or close.5. Great Accessories: Small in size, easy to carry, and excellent in performance, the water filler cap is an excellent accessory for boats, yachts, and RVs.Specification:Item Type: Boat Water FillerMaterial: ABS Engineering PlasticsBottom Diameter: Approx. 38mm / 1.5inProduct Weight: Approx. 112g / 55.4ozProduct Description:1. Rustproof, corrosion resistant, durable.2. Purpose: Suitable for fuel tank caps of RVs and yachts..Package List:1 xBoat Water Filler