Oh, well if you can see the back of the water heater and it doesn't have a bypass, then perhaps one isn't installed. Perhaps someone can show a picture of what one looks like, just to make sure?
If you don't have one, I think you can install it - I've not done that as my trailers have had them already.
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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