Pictures at 11...
So the water doesn't go skunky in the lines sitting in the driveway between trips, I usually open these drains, the freshwater tank drain and open all the faucets after dumping when leaving a campground. The airflow over the openings going down the road will suck all the water out.
2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam