There are adaptors to go from NTP whichI think is the technical term for the tubing and PVC. It will have a fitting on one end to fit into your PVC. You can get either threaded or push on fittings. Use what ever method of attaching this fitting to your PVC your comfortable with. I suggest pvc glue to form a good water tight perminant bond. The othe end of the fitting is a push on fitting that is groved and tapered. You push the PVC on to this fitting till its all the way up to the tapered sholder. Before you push the tubing over the fitting get a stainless steel hose clamp and put over the tubing. Then when the tubing is slid onto the fitting you put the hose clamp up over the area where the fitting is maybe 1/2" from the sholder and tighten with a screwdriver. This will form a water tight connection and you have then sucessfully gone from PVC to tubing.