On my x23B, the external valve is for the fresh water tank..
The low point valves are inside the trailer, under the bathroom sink. There are two of them one for hot and one for cold.
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Charles in SLC, UT (formerly in Cincinnati, OH.)
2014 F-150 XLT, 3.5EB , HDPP
2011 Jayco x23B
Blue Ox SwayPro WDH
2006 Honda Ridgeline (retired TV)
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