I have a drain pipe located underneath under a bathroom sink.
Half of the sewer pipe is black ABS, while the other half of the pipe is made out of white PVC.
There are no threads on either side. We cannot use a threaded nut and slip washer.
No threaded couplings may be used, unless we maybe buy something which is threaded at both ends. Both sewer pipes have the same diameter.
Maybe a straight smooth (unthreaded) coupling would work?