Not sure if the Manabloc used on a 98 Monaco Windsor is the same, but I had a burst manabloc & leaks everywhere. I ordered a new manabloc from Supply House cut out the old block and mount only to recognize the fittings and pipe sizes were different In name they were the same but just would not fit the old plumbing. I ended up replacing all plumbing (and fixtures) with new pex (blue and red Home Depot & Lowes) I used crimp and stayed away from sharkbite fittings.
While I was in the wet bay I gutted it. Replaced all panels with polyethylene sheets cut to size, added lines for an outdoor shower, macerator, heaters for the 3 tanks and insulated the entire plumbing system.
Hope this helps.
Tom
97 Windsor