TIG Welded, Strong, Light weight 5051 Aircraft Aluminum Alloy Construction. Fabricated to your exact size specifications or Custom Tailored to fit in tight quarters. Comes complete with -8AN, -10AN or -12AN welded aluminum bungs and mounting tabs. Available with a 6 hole flush mount, red cap or 2 ½” CNC Billet Aluminum filler cap. Polished or powder coat any color for an additional fee. 4 gallon.