A pump module mountable to a chassis of a fire truck includes a pump assembly having a water pump and plumbing connected to the water pump. A lower housing defines an enclosure that includes opposed exterior panels, opposed interior panels and a top opening defined by an upper perimeter. At least one of the exterior panels maintains a fluid connection to the plumbing of the pump assembly. At least one of the interior panels includes an interior opening to accommodate the chassis and a connection between the water pump and an engine. An upper housing defines a lower perimeter that can be positioned with respect to the upper perimeter of the lower housing. The upper housing transitions between a first, operating position wherein the lower perimeter engages the upper perimeter, and a second, open position wherein the lower perimeter is spaced apart from the upper perimeter.