Moto Iron 2.1 Gal. Narrow Alien Gas TankMoto Iron 2. 1 Gal. Narrow Alien Gas Tank 2. 1 gallon capacity Pressure tested Accepts bayonet style (cam lock) fuel cap; not included Threaded ports to accept either 3 8" petcock or 1 4" petcock Unused port(s) will need to be plugged; plugs available separately Tongue type mounts 18 1 2" tab to tab, tank body 17" Though these tanks are pressure tested from the factory, pressure testing before applying filler or paint is standard practice. If needed,