2004 Dolphin Water Heater
It's behind the large sq. panel with a vent in the middle. You will need a dowel or pc of PVC pipe to prop it up it hinges on the top. Mine is on the right side between two compartment doors.
It's the door on the bottom.
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2005 National Dolphin 6376LX, W-24, 8.1 Vortec, 2100 Allison MH 5 speed, Safe T Plus, Toyo tires, TireSafeGuard TPMS, 2019 Equinox 1.5L, Blue OX Aventa LX tow bar, Roadmaster EZ5 baseplate, SMI Stay-In-Play Duo