yes the overflow is pvc plastic, the water tight fittings have a rubber seal to seal the water out. I thought about removing in the winter depending on how tight the seal was. The other thing i should mention is I was thinking about putting an aerator in the pond so I thought about moving it to towards the overflow pipe in winter to keep it from freezing, but i wouldnt want to run it all the time. I appreciate the thoughts, advice and previous experiences please keep them coming so I can make up my mind.
