15 Gallon Stainless Steel Reservoirs with Valve Enclosure from Buyers Products includes a water-resistant stainless enclosure for the valve. This all-in-one design has a small footprint that makes it easy to remove, access, and install on a new truck. The reservoir is constructed of high-quality 10 Ga, 304 stainless steel. Its sleek, polished appearance will stand up to salt and weather for long-lasting use. It also features a tank-mounted 50 GPM return line filter, a nylon rust-free filler/breather and a fluid level and temperature sight gauge.