RotopaX 2 Gallon DEF Container

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Running a modern diesel truck with a Selective Catalytic Reduction system means DEF is just as essential as fuel — and just as easy to run low on in remote areas where it is not st ocked at every gas station. The RotopaX 2 Gallon Diesel Exhaust Fluid Container gives you a mount-ready DEF reserve that integrates directly into your existing RotopaX setup, keeping two gallons of DEF on board and accessible whenever you need it. This is the original DEF container from RotopaX, built with the same thick-walled, roto-molded construction used across the lineup. The interlocking bottom design is the key functional difference from the GEN 2 version — it allows this container to interlock at the base with another 2-gallon RotopaX container (gasoline, diesel, water, or storage) to effectively create a combined 4-gallon unit in the same footprint as a standard 4-gallon pack. If you already run an interlocking setup or want that combination flexibility, this is the version to choose. If you prefer the simplified flat-bottom design at a slightly lower price point, the GEN 2 is the alternative. It mounts to the full RotopaX system using Standard, DLX, and LOX pack mounts and can be stacked using the 1, 2, and 4 Gallon Extension. The slim 3-inch depth profile keeps it flush against bed racks, roof racks, spare tire carriers, tailgates, and MOLLE panels. As with all DEF containers, this should be used exclusively for DEF — cross-contamination with fuel or water, even in trace amounts, can damage your SCR system. Show more