Self Piercing Feed Water Tap Valve - Used on copper lines instead of the ''screw together'' easy tap described above.
Make sure to install it in-line after the cold water shut-off valve. Mount and tighten the self piercing valve on the copper line in a easy to reach place. Turn the saddle valve clockwise all the way in. This drives the sharp end of a sharp metal pierce into the copper tubing and will pierce a tiny hole. This is the ''OFF'' position for your new RO system. Turn counter-clockwise to open and turn on.