Get the power and performance you need with the Delavan on demand diaphragm pump. This pump operates as a bypass pump, demand pump, or bypass demand pump. As an on-demand pump, it uses a demand switch that operates only when liquid flow is required. The 12-volt permanent magnet motor is thermally-protected and splash-proof. This diaphragm pump has a 3-chamber positive displacement, is capable of being run dry, and has excellent self-priming capabilities. This particular Delavan on-demand pump runs liquid at 140 degrees F maximum. With this pump from Delavan, you don't have to worry about a thing.