As part of the Fuel Pro® Series, the Fleetguard® FH23031 with EleMax™ filter technology is a fuel/water separator that removes water and contamination from your fuel before entering the fuel pump. The Fuel Pro is available in several variations, which offers unique features, like Water-in-Fuel sensors to monitor collected water levels, fuel heaters to maintain proper temperature, and Seeing Is Believing™ technology that tells users when to change the filter.