Yes, those are Low Point Water Drains. They should be closed when in use, opened to drain the water lines. They are pull up to open to drain, push down to close to run water thru lines. On my unit, I sometimes have to twist the T- handles as I close them to seal tight. Good Luck with the new camper.
2020 Cherokee Wolf Pup 14CC
2017 Chevy Colorado Z71 4x4 3.6 L