DC-904000-1.5, Duracast 4000 Gallon Plastic Storage Tank | 904000 These vertical plastic tanks are generally used for bulk storage and can withstand a broad PH range without becoming damaged. People commonly use these tanks to store a variety of chemicals, many acids, liquid fertilizer, liquid feed and potable water. Manufactured to the highest industry standards, these tanks will provide years of quality storage. The polyethylene resin is compounded with UV stabilizers to meet your outdoor storage needs. Able to combat physical attack, these tanks will not become easily damaged from adverse environmental conditions. A 16-inch vented lid allows you to fill tanks quickly without spilling. Measurement indicators are molded into the tanks for determining content levels. This is a 1.5 specific gravity tank.