Job Shack Tanks are used in a variety of stationary applications for the storage of fresh water and grey water and are ideal for crawl spaces under homes, trailers, and low ceiling areas. Tanks are also used as a waste holding tank in portable applications. Tanks are manufactured from medium-density polyethylene with U.V. inhibitors and designed for containment of liquids of up to 1.7 specific gravity. Tank walls are translucent for level viewing and equipped with gallon indicators.