Dee Zee Liquid Transfer Tank / Tool Box Unit

Dee Zee Liquid Transfer Tank / Tool Box Combo Units

For truck owners who demand maximum utility from every inch of their bed, Dee Zee has engineered one of the most practical solutions in the pickup truck accessory world: the Liquid Transfer Tank / Tool Box Unit. These purpose-built combo units merge a high-capacity liquid transfer tank with a full-featured lockable toolbox into a single, space-saving assembly — giving hardworking drivers the ability to haul fuel and gear without sacrificing precious truck bed real estate.

American-Made Construction with Proven Materials

Dee Zee's combo units are available in two distinct material configurations, each engineered for long-term durability in demanding environments. Models are constructed from non-rusting Brite-Tread aluminum or 14-gauge steel with NRT™ corrosion protection, featuring internal fuel baffles, reinforced toolbox lids, and weather-tight seals for long-term durability. The aluminum variants benefit from a material that is durable, lightweight, and eliminates the worry of rust, while steel models are protected by a black NRT™ (No Rust Technology) rust inhibitor powder coat finish.

A defining structural detail across the entire lineup is the radius curve design that eliminates key weld pressure points, a sign of thoughtful engineering aimed at long-term structural integrity under the stress of liquid loads and road vibration. Tanks are hydrostatically pressure tested up to 29 psi to ensure they meet the highest level of quality.

The Specialty Series: L-Shaped Combo Design

Dee Zee's flagship combo offering falls under their Specialty Series, featuring an L-shaped footprint that makes smart use of truck bed corners. Capacities span a wide range — from compact 43-gallon low-profile models designed to fit under most tonneau covers all the way up to 111-gallon configurations for maximum extended-range capability. Tank features include a cab and coupler for venting, four stability baffles, and a drain plug to help manage liquid movement and enable safe, complete emptying between uses.

The integrated toolbox side of the combo unit is no afterthought. The tool box offers lockable storage with high-quality stainless steel paddle handles and features gas shocks, a hidden hinge, Alumaguard strengthening channel, a closed cell foam gasket, and self-adjusting strikers. This level of detail — typically reserved for standalone premium toolboxes — is a hallmark of Dee Zee's approach to combo engineering.

Liquid Transfer Tank / Tool Box Combo: Key Considerations

Dee Zee combo auxiliary transfer tanks are tested and certified to hold diesel fuel for refueling equipment at the job site or for transferring directly to your truck's fuel tank during longer commutes, making them an ideal solution for ranchers, construction crews, and long-haul drivers. It is important to note that these tanks are not designed for use as a primary auxiliary fuel system and are not for use with gasoline.

For those who already own a Dee Zee transfer tank, the Dee Zee Combo Tank Adapter Kit allows you to attach a utility chest toolbox to your existing transfer tank, providing additional storage for gear or tools — a flexible upgrade path that extends the value of your existing investment.

Backed by Dee Zee's decades-long reputation as a staple brand in the truck accessory market since 1977, these combo units represent the same OEM-caliber manufacturing quality that has earned the brand trust among both everyday truck owners and fleet operators alike. Browse the full Dee Zee brand catalog or explore all Liquid Transfer Tank / Tool Box Units to find the right combo for your truck and workload.