You can assemble and remove quickly just by hands. It is designed to be easy to install and can be quickly replaced or installed on existing fuel tanks without complicated tools or techniques, greatly saving installation time Made of plastic, with good durability of the fuel tank cap, has good chemical resistance. It can resist the erosion of acids, alkalis and solvents, and can maintain performance even in harsh environments The vent cover of the fuel tank is equipped with a torsion valve for adjustable ventilation. It fits tightly without leakage. The exhaust screw is easy to turn for loosening and closing. No tools are needed. Just turn the cylinder cap on the top of the fuel tank to ventilate the tank correctly. Marine fuel tank covers are specially designed to be compatible with old-fashioned portable M'oeller and T' fuel tanks. Compatibility: fit for a variety of fuel tank models, including 031103, 031106, 031109, 031112, 031212, 620003, 620049, 630012, 630013, 630014, 620040, 720040, 730014, and 730025 Compatibility: 621501-10 boat gas tank cap Compatible with for A-ttwood 12 gallon, 6 gallon and 3 gallon tanks, B-ass Tracker boat tank, S-cepter 12 gal and 6 gallon tank, 3 gallon Q-uicksilver plastic gas tank, old 6 gallon plastic -Tank Essence, for Mercury plastic tank, for and more name:Fuel tank cap Material: Plastic Color: Black Part Number:621501-10 Package Contents: 1 x Fuel tank cap Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.