The SeaSense Securestack 6 Gallon Stackable Fuel Tank is an innovative fuel tank for boaters that allow for 2 tanks to strap together for easy transportation. It has handles on either end, two 1-1/2 wide grooves for secure tie down which eliminates shifting while underway. It meets USCG / ABYC / EPA requirements. It has built-in 5% vapor volume expansion chamber, low permeation fuel tank and cap, plus, an improved fuel valve. It is made of durable, high density polyethylene and each tank measures 20L x 13-1/2W x 9-1/2H.