Yes, I think that is very possible that it froze after I winterized last year. I did not take it off after I drained the fresh water tank. Actually, most years, including this year. I'm taking the it down to warmer temperatures for storage. That is what I am doing right now. In the warmer climate, I'm able to just blow out the lines and drain the fresh water and hot water tanks and it survives just fine.. Unfortunately, I won't be able to get the part before I pick it up next year.
Also, I can't find they sell just the plastic piece. However, for the price, I will buy a full assembly and try to just use the plastic part and hopefully not have to replace the full assembly. It seems kind of tight in the space and I might have to take apart more of the wall than I would like to... Also, without pulling it part, it seems that the top part is threaded and the bottom part is "barbed". I don't actually see any assemblies that look that way...
In any case, thanks much to everyone who responded.
I'm extremely glad this forum exists.. Just the fact that I really didn't know this was called a "strainer" and someone was able to give me that simple fact, moved me a long way... Maybe I'm just naive, but thanks anyway..
MH Sunseeker 3010 DS (2014)