I received a call from my tenant that the AC system was leaking water. Immediately I thought condensate line must be clogged. As you can see from the second image, the installer did not connect anything to the left side port, which is where the water was leaking (ignore that male connector for the purpose of this discussion).
It appears the original installer did not install anything on the open port because he ran the drain line across it, so that the filter could be removed, which is another question (why installed right there, instead of on the side). With the drain going across the open port, the installer just left it opened, which does not seem right.
Question: Should this port have been plugged, or should an adapter and piping been connected, so that a cleaning solution can be dumped into the evaporator to aid in keeping the drain line clear (I notice my unit has this and I was told by the installer to add a cap of bleach to the unit once or twice a year to keep lines clear)
1st image is my house; 2nd image is rental property