Key benefits Convenient keyless design: The deck filler port surface is clearly labeled for easy viewing. It uses a keyless cap with a built in tab; simply lift the tab and turn to open or close, speeding refueling without keys. Strong sealing and durable construction: Professionally tested for air tightness to prevent fuel or water leakage. The stainless steel marine filler port uses a threaded connection for a firmer fit and improved sealing performance, reducing the chance of spills. Compact, robust specifications: Weight approx 485 g (17.1 oz). Size approx 8.5 x 8 x 5.1 cm (3.3 x 3.1 x 2 in). Built to resist corrosion in saltwater environments, with smooth operation and long service life. Broad compatibility and practical use: Suitable for ships, yachts, docks, trailer tanks, water storage barrels, rain barrels, and water towers. Reliable performance across multiple applications. Technical details Material: Stainless steel marine filler port Connection: Threaded Weight: 485 g (17.1 oz) Size: 8.5 x 8 x 5.1 cm (3.3 x 3.1 x 2 in) Sealing: Air tightness verified; designed to prevent fuel and water leakage Applications and use scenarios Boat refueling on a yacht or small vessel: Use the keyless cap for quick, secure deck fueling without fumbling for a key. Dockside fueling or water storage mixing: Install on trailer tanks or water storage barrels for reliable filling at marinas or sites with limited access to keys. Rural or port facilities: Use on rain barrels or water towers where corrosion resistance and leak prevention are important for long term performance.