I don't know what this is.
Can someone tell me what a Manabloc Water System is? I've not heard of it.
Forum Discussion
The manabloc system was used on high end coaches to isolate various plumbing segments in the coach. If you broke a water line in the bathroom, you could turn off that line without losing use of the rest of the coach. I'm sure it also aided in winterizing. I haven't seen them in new coaches for a long time, maybe a Newell or Prevost level will still have them.