Ya, under the trailer there should be a tube with a cap on the end of it.
You may find a tube with no cap which might be the fresh water overflow tube.
2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." 2014 19 days camping 2015 17 days camping201620 days camping