Gravity feed diesel to increase driving range with the RDS 51 gal. Auxiliary Aluminum Fuel Tank Toolbox Diamond Plate. Shop for better fuel prices; no more constant stopping when pulling a travel trailer or 5th wheel. It features no-rust aluminum construction with fully welded seams and is 100% pressure tested for safety. The built-in baffles help to reduce sloshing. It also comes with a rollover safety valve (vent) and includes a 3/8 in. FTP drain plug and 0.125 in. heavy-duty aluminum construction. 2 gas filled lift cylinders assist in opening and holding open the toolbox lid. It also comes with 2 stainless steel paddle opening handles, with 1 locking lid that can be opened from either side. A visual fuel gauge is included. Make easy work of your next job or task by having this fuel tank on hand.