The 3-gallon marine fuel tank is made of high-density polyethylene, which is anti-aging, impact-resistant and corrosion-resistant. It can bounce back naturally after an impact without permanent deformation. 12 Litre (3 Gallon) capacity most people call this a 12lt tank but its only 11.3LT Screw-on cap with breather vent.Standard nozzle: outboard motor(above 6HP)interface from the back holes. Two Modes of Sealing and Venting-There are two designs of fuel tank cap, which can be sealed or vented, and the metal nut can be vented and safe to use(High-quality spring designed for deflation, Unscrew the yellow metal nut to release the air in the fuel tank. Tighten the yellow metal nut and the oil tank is airtight), which helps to form a smooth fuel flow, thereby minimizing leakage. Equipped with I-shaped handle, more ergonomic, easy to carry and store, rust-proof, durable, beautiful, easy-to-use handle design, light and portable, easy to place and carry.Fit for Small to Large Boats, Inflatables, Tinnies, Canoes and Kayaks.