I bought two of these and the one I'm using works great but I don't think I need the second one after all. The photos are stock photos because mine is still in the original box.
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Very heavy duty and durable unit. Of course it can never rust...
Travel Trekker 50 Gallon Auxiliary Fuel System (5410050)
Includes all the hardware, pump, and electronics to transfer diesel from this into to your factory tank as you drive.
More info here: