E+D+J Fire pump system, with electric pump, diesel engine pump, jockey pump and control panel. Fire pump system E+D+J,Operation: ... stainless steel, mechanical seal is carbon/ceramic.2. Diesel engine pump, with capacity equal to electric pump capacity, fuel tank.3. Jockey ... for main electric pump, hand off auto selector switch for each pump, indication lamps for pump run and pump trip, pressure switch ...