Burch brings you portable fire-fighting capacity for less! All tanks are made of heavy PVC (polyvinyl chloride) coated nylon. Resists chemical contamination, mildew, rot and solar heat exposures, will withstand -40 degrees and severe outdoor exposure. Tanks are electronically heat sealed. Frames of FK Kolaps-A-Tank made of 7/8' OD tubing Designed for easy, two-person set-up at a remote sites.