Highland Tank Hoppers are compact, low-profile state-of-the-art technology for secondarily contained, aboveground storage. They are suitable for the storage of all types of liquid fuels, new and used oils, waste solvents and antifreeze. Available in nine convenient capacities, we have a hopper to meet all of your site-specific requirements. All Highland hoppers are designed and built to UL 142 specifications. Each Hopper consists of an inner tank, placed in the second tub-like steel container, which provides a minimum of 110% secondary containment. The unique, extended top design prevents rain, snow and debris from collecting in the secondary containment. Elevation supports and a 2Ã¢â‚¬Â interstitial monitoring pipe and primer paint are included on all models.