The water heater by-pass valve ( s ); there may be 1 combination valve or 3 valves in close proximity , should be beside or behind the water heater.
I'll see if I can track down a picture.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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