Pelican Tank Rack 4 Tank A tank rack designed to meet most air tank storage requirements. Constructed of .25" diameter cold rolled 3 gauge carbon steel with Dura-Coat electro dipped marine grade polyester coating. Will fit all 6.9" dia. (72c.f.) and 7.25" dia. (80c.f.) cylinders with boot. Will also fit large 8.0" dia. (90 & 100c.f.) cylinders without boot.