Welcome joe1028!

Like I said, some have ones that work, and others don't. I'm glad! that yours does as it's supposed to!

Unfortunately, a LOT of folks don't have your good experience

(note - there is a LOT of extra piping involved in one of these and that can cause additional problems - the pipes are buried and not readily accessible if one breaks- folks who don't have 'deep freeze' winters are more likely to have less problems than those in that have a deeper frost line)

FWIW- I was 'certified on the "Caretaker 99" systems in '91