Our uniquely designed oil tanks are the safest and most reliable on the market. The outer tank is made out of leakproof weld-free galvanized steel and roll seamed with an oil and fire-resistant seal. It can contain at least 110% of the capacity of the inner tank for maximum protection. The inner tank is made of blow-molded, high-density, seamless polyethylene that is leakproof and will never corrode. And, our compact tanks are available in several different sizes providing more flexibility for placement in any garage, service station, or lube shop. The Roth DWT storage tank is certified to UL SU2258 and is designed to store liquids that are classified as class II class III combustibles. These include automotive lubricating oils, motor oils, hydraulic fluids, waste oil products, diesel, biofuels, DEF, and ATF. The Roth DWT is compliant with NFPA 30 and 30A, subject to building code approval by the local authority having jurisdiction.