Northwest Conversions wheel well water tanks are great for making the most of your van build space. Our water tanks are designed to fit over the wheel well, optimizing the space and having a lower center of gravity. There are spare tire water tanks and two types of undercarriage water tanks. The tanks are made from BPA Free Food Grade Plastic and are the most durable polyethylene tank available. We offer a variety of models of different water tank sizes and include ports that are located both in the front and the back of the tank.