Yes my first trailer had no by-pass valve. I purchased one at the local rv store and installed it myself. You might also not have one. Yes you can just pull the plug and allow the heater to drain without any AF inside.
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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