Leading boat builders use Moeller Marine Permanent Fuel Tanks because... Features: Comes standard with our exclusive Hose Tite? machined-aluminum fill spouts, and vent fittings molded into the tank shell Machined-aluminum 3/8'' withdraw fitting has 360? rotational capability for hook-up convenience The fittings hold the highest O.D. & I.D. tolerances in the industry, ensuring you the highest level of input flow available during refueling When measuring for tank dimension, allow for hydrocarbon swelling causes tanks to expand in all directions by 3% Add 2-1/2'' for fill neck fitting to overall tank height