Features: Crafted from high performances UV resistant polymer, this marine grade 38mm black oil filler neck features a secure design with a locking base and engraved "GAS" marking for leakproof management on boats and campers. The 1.5 inch inner diameter straight neck construction integrates a professional rubber O rings seal to prevent oil/water leakage, while its polymer body withstands saltwater corrosions and harsh marine conditions. Ideal for marine enthusiasts,campers owners, and agricultural vehicle operators requiring oil access solution for pontoon boats, bass trackers, motor yachts, caravans, trucks, and tractors. Designed for expose deck installations on watercrafts and exterior mounting on recreational vehicles, this filler neck maintains functionality during rough seas or long highway journeys. Engineered with anti theft lid mechanics and materials certifications for marine applications, this filler neck meets rigorous demands for UV stability, chemical resistance, and impacts tolerance across multiple transportation platforms. Specifications: Component: Plastic Diameter:38mm/1.5'' Package Includes: 1Piece Boat Deck Fill/Filler Caps note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.