Plumbing Kits for Camper Van Sinks and Combination UnitsPlumbing Kits for Camper Van Sinks and Combination Units These kits provide the parts needed to plumb one of the Dometic, CAN or Thetford sinks or Hob Sink combination units into your campervan conversion. The Kits include the following: 2 Metres of fresh water hose and a 2 metre waste hose which has a smooth inner bore, to stop build up of waste inside the pipe. Some other cheaper hoses have a ridged inner surface. Two wide neck Reimo water