This is a copper and brass heat exchanger we built at a customer’s request. It is similar to the old original R&M Specialty Products vehicle mounted hot water element that is no longer available. How it works is you mount the heating element to your vehicle and plumb your vehicle engine coolant to run through the heat exchanger. You then pump water be it from a creek or any other water source through one of the other 2 ports on the heat exchanger and then you get warm hot water out of the other port that you would hook up to your portable shower head. This allows you to pull up to a creek for example while out hunting or camping and still have the comfort of taking a warm hot shower. If you can dream it up or give us a sample idea we can fabricate and build it. Motor Mission Machine & Radiator 5435 Desert Point Dr. Las Vegas, Nv. 89118 Ph: (702) 649-2366 or (702) 649-0648 Fax: (702) 649-4133 www.MotorMission.com Facebook.com/MotorMission