I agree with Ron. Those are likely your low point water drains designed to drain the water from the system. There is a cap on it that has to be tightened on, if you see no cap the other variation is a thumb valve but that is usually near the water connections for the camper.
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allentx1
2011 Avalanche 340TG
2010 Ford F-250 6.4l Power Stroke 2wd
Pullrite auto-slider hitch
Austin Texas area
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