Looking at the pics and the 311 online, I see where my difficulty was. I tried to put in an Aqua Magic and the hose access didn't quite line up.
From these pics it looks like if you take a Dometic out, you have to put a Dometic back in.
Thank you for the pics. When I get the coach back, a new Dometic is going in. Hate that plastic bowl!
2018 Coachmen Freelander 27QB