Is there a safe way to hook up the drain from a water softener into a houses
main PVC drain in the basement? The installation manual directs that an air
gap be maintained so that the water softener will not be able to draw from
the drain source. The problem I have is that the main PVC drain is not
accessible to be able to move it around, since it is mostly concealed behind
finished basement walls. Only about three feet is exposed where it exits
the basement. Is there a sort of fitting that can be installed into the
main PVC drain that does not require the drain to be moved (like a section
of it can be cut out, then the new fitting installed)?

Any suggestions appreciated.

Location : Pennsylvania
3" dia. pvc

Steve