Custom made stainless steel hydraulic oil reservoir made to fit a Peterbilt 379 Extended Hood Truck with a wet kit that has the big 70" sleeper. The tank sits between the frame rails behind the sleeper. Only about 2 inches of the tank shows above the frame rails. It was made with a U shape that wraps around the main driveline. It has a 40 gallon capacity. It has a top fill hole, 2 drain holes in the bottom of each side, one return hose port with ball valve, & 2 suction hose ports with ball valves. This tank looks good on the truck because you can't see much of it where it mounts between the frame. It looks much better than one of them bulky side saddle tanks.