The passenger side rear door opens to another clam shell enclosure. This one took a bit longer to put together. It is built a bit taller, at 12" inside. It encloses our on demand hot water shower system, air compressor, and electrical inverter. The water tank for the system dictated the height for the clam shell, and subsequently the rear drawer set.
The hot water system provides pressurized, temperature adjustable hot water for showers, and cooking. It draws from a 40L water tank also located in the clam shell. The tank is an early model Front Runner 40L Roof Rack tank. I connected it to a prefilter and then to a Sureflo Marine Grade Pressure Sensitive Water Pump. The pump draws the water through and into a 1.5 gallon electric water heater that can heat the water to 180 degrees. The hot water is then blended with cool water at a shower valve, and fed through a 12' line with a shower nozzle. We use a Eezi-Awn Series 2000 2.5 meter awning and Rec Vee panel set to create a very large shower room on the side of the truck. It works really well. Also on the front of the clam shell is a gravity flow water valve for tank water access without having to use the shower head.
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Installed next to the shower system is an Estreme Outback ExtremeAire Magnum compressor. It is tied into a 80 amp breaker and can generate 150 psi continuous. The blue hose in the photo is a heat dissapation hose designed to remove the heat from the air coming through the line. With the clam shell lid open, it has enough space to operate correctly.
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We also attached a 800 Watt Cobra power inverter to the face of the clam shell to address our charging needs. Both 120V and USB charging available. I had a larger inverter on my old drawer set, but I believe the 800W unit is plenty for the items we use it for. The power for the clam shell can be disconnected via a set of 200A Anderson style connectors in the passenger rear side storage. The clam shell is removable for replacement of the second row seats. The change out time is under a half hour.