That is the by-pass valve. If the trailer was winterized with antifreeze that valve should have been closed to prevent antifreeze from going into the water heater. The valve is only 1/4 turn to the normal position and the tank should fill with water. If you turned on the electric to the water heater without water in it the element will need replacing.
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Hank & Lynn
2007 Cougar 290RKS, E-Z Flex, 16" XPS RIBs ( SOLD .. Gonna miss her ... looking for new 5r)
2004.5 Dodge 2500 QC, LB, 5.9HO, WestTach gauges, Ride-Rite
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