I am trying to repair a one inch PVC pipe connection going into the inlet (suction) side of a water pump. Due to improper mounting of the pump the vibration of the pump caused the cement joint of the pipe/fitting into the pump to fail. I cut the "old" fitting off and proceeded to "mock up" a new connection to the pump. The old pipe that I am trying to connect to is "thin wall" pipe commonly referred to as sprinkler pipe. I find it impossible to dry fit a one inch pvc "coupling" onto the old thin wall pipe to start a new connection to the pump. I have cut the old pipe back twice thinking that the pipe at the first cut was damaged or out of round to receive the new coupling.
Is it possible that the old pipe went through several freeze/thaw cycles during the winter and caused the pipe to expand enough so that a new coupling fitting would not fit the OD of the thin wall pipe. This is the first time in many years of working with PVC pipe that I have had problems with fittings not fitting a pipe.
Any suggestions would be welcomed and thanks for viewing my "problem".