Direct: (503) 987-4002
Main: (503) 987-4000




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 stocked 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.
We ship throughout the United States. Most in-stock items leave our shop within 1–3 business days. Made-to-order, special-order, drop-shipped, freight, and oversized products may require additional processing or lead time. Any known special timing or availability information will be noted on the product page when applicable.
Orders placed outside of our normal business hours will be processed as soon as possible once our team returns during regular operating hours, Monday–Friday. Orders placed over the weekend or on a holiday will begin processing the next business day.
Eligible items may be considered for return within 30 days of delivery. All returns require prior authorization from PAD Overland. Return requests are subject to our return policy as well as any applicable manufacturer or supplier return requirements.
Approved customer-requested returns are subject to a 35% PAD Overland restocking fee, plus any additional return-related fees imposed by the manufacturer, supplier, or distributor.
Many products sold by PAD Overland include a manufacturer warranty. Warranty claims are subject to the individual manufacturer’s warranty terms and procedures. We are happy to help facilitate the process when possible. Please contact us with your order number, photos, and a description of the issue.
Questions about fitment, shipping, return eligibility, or a special-order product? Please contact us before placing your order. Our team is happy to help make sure you are ordering the correct product for your vehicle.
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