On May 31, 2:15*pm, Ook wrote:
While I was digging up my water pipes, I came across a PVC compression
coupling that was used to connect two metal pipes together. How
suitable is this? This is in the main water line that goes into my
house, and I"m concerned about the life span of this coupling. It
doesn't leak at this point, but what kind of life span do these things
have? If I leave it, am I going to have to dig it up in a couple of
years when it starts to leak? I have most of this pipe dug up right
now, and it would be easier to replace it all now than to have to dig
it back up in a couple of years. OTOH if these things are good for a
few decades, then I'm just gonna fill the ditch in and leave it.

Boy, you sure can start enough new threads about the
same thing. In the original thread you said the pipe from
the street was 40 years old, rusted, in unknown condition, etc.
Now you have it dug up and you're worried about just one fitting?
Why not just replace the whole run with whatever is approved
and typically used in your area? As I stated before, around
here, this part of NJ, that would be black poly 1" pipe.