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




Modern diesel trucks equipped with Selective Catalytic Reduction (SCR) systems require Diesel Exhaust Fluid to run cleanly and legally — and running low on DEF in a remote area can shut your truck down just as effectively as running out of fuel. The RotopaX 2 Gallon Diesel Exhaust Fluid Container GEN 2 gives you a mount-ready DEF reserve that fits into your existing RotopaX setup without any additional hardware or brackets. Two gallons of DEF on board covers a meaningful amount of miles and gives you the buffer you need when DEF availability is uncertain.
The GEN 2 brings the same updated design as the rest of the GEN 2 lineup — same 2-gallon capacity and overall dimensions as the original, but with a simplified construction that eliminates the complicated twisting bottom mechanism. The result is a cleaner, more straightforward container that is easier to work with in the field. Construction is the same thick-walled roto-molded build used throughout the RotopaX system, with a leak-proof cap assembly that holds up to vibration and rough terrain.
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. One critical note for DEF containers: DEF is corrosive to many materials and even trace contamination from other fluids can damage your SCR system — this container should be used exclusively for DEF and never shared with fuel, water, or any other liquid.
We ship nationwide and internationally. Most in-stock items leave our shop within 1–3 business days. Made-to-order and oversized parts may require additional lead time; any special timing will be noted on the product page.
If an order is placed outside of our normal business hours (Monday–Friday), we will process it as soon as possible once our team is back in the shop during regular operating hours. Weekend orders will be handled the next business day.
We want you stoked on your gear. Eligible items may be returned within 30 days of delivery for a refund or exchange.
Many products include a manufacturer warranty. We’re happy to help facilitate claims—reach out with your order number, photos, and a description of the issue.
Questions about shipping or returns? Get in touch—our team is here to help you get trail-ready.
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