My installer took the cheap way out and glued the PVC pipe into the inlet and outlets of the heat siphon heat pump exchanger fittings. I drilled a hole in the lowest part of the PVC pipe coming from the bottom of the heat pump and tapped it for a screw. A few wraps of teflon tape around the threads of the screw keeps it water tight and I can now remove almost all of the water by blowing air into the unit while that screw is out.