It seems like pressure vessel of the backflow preventer broke during cold season in Texas. Water is leaking from black plastic part of pressure vessel with a hairline crack. I'm surprised that pvc pipe and everything else seems to be solid at least visually. I tried to winterize the system including leaving test valve partially open, which obviously didn't work...
I watched some videos and instructions on how to replace pressure vessel. The actual part of replacing the pressure vessel seems straight forward. What I am concerned about is how to do testing with differential pressure gauge afterwards. I don't have the tool and it seems like renting it can be challenging. Can I just replace the pressure vessel without testing it afterwards? I'm trying to see if I can save money by trying to do it myself since I have a lot of other expenses going on at the same time. But I also don't want to cause damages that will cost even more money in the future.