Prior to Drain saddle installation, it is important to inspect the condition of drain pipes to make sure they are not thin and frail. Drain saddle valves are designed to be installed on standard 1-1/2" OD drain pipe. Install the drain saddle valve above the trap (between the sink and trap) and on the vertical or horizontal tailpiece. Never install a drain saddle valve close to the outlet of a garbage disposal or plugging of the RO drain line may result.
Never position the opening at the bottom of the pipe. A side or top position is recommended. Install the rubber gasket on this half of the drain saddle. Be sure the gasket hole is lined up with the port hole.
A screwdriver may be used to keep the holes oriented during the tightening process.
(Do not over tighten. Make sure there is equal space between saddle halves on each side.)