Clean around the outside end of each pipe with a rag to remove all dirt or grease. Look at the end of the pipes for any burrs.
If any exist, use fine sandpaper to remove burrs from CPVC or PEX, and a steel file to remove burrs from copper.
Measure 1 inch from the end of each pipe being inserted into the SharkBite coupling, using a tape measure. Mark the pipe at this 1-inch point with a black marker pen.
Push the pipe ends into the ends of the SharkBite coupling until the mark on each pipe meets the end of the coupling. A small click will be heard as the pipe ends connect with the O-rings inside the coupling.