I have finished cementing all basement plumbing.

Everything went great except my shower drain is not

completely vertical and 18" on center for my shower.

It is off 3/8" to 1/2" to center. To fix this problem

I was thinking of cutting the pvc 8" below the cement floor

and putting in a rubber coupling that is flexable

enough to move 3/8 to 1/2". By the way there is

5 sq inch opening in the cement floor so I can cut

the pvc out. Is this an option or do I have to

dig up the cement and replace the p-trap and pvc.

Thanks in advance