A coworker mentioned that he was having a refrigerator delivered and his weekend project was connecting the water supply line. I told him to grab a saddle valve and turn his weekend project into an hour-long project. Saddle valves make it easy to tap into water supply lines. Here
plumbing - How to stop fridge water line without stopping everything else? - Home Improvement Stack Exchange
How To Install A Refrigerator Water Line (Homeowners Guide)
Customer called about running a fridge line. Got here and they said the carpenter went ahead and did it.. we're still here to run a new fridge line. : r/Plumbing
Saddle valves: cheap, easy, and wrong
Plumbing What Threading Type Is My Ice Maker Shut Off, 46% OFF
How to install a refrigerator with ice and water dispensers
How to Install a Water Line for a Refrigerator
Plumbing What Threading Type Is My Ice Maker Shut Off, 46% OFF
Fix for low flow on your refrigerator water line installation
Contents: One Compression self-tapping saddle valve Compatibility: This valve is lead-free which makes it suitable and safe for all potable water
Brass Self Piercing 1/4-Inch Compression Outlet - Connect a Refrigerator Water Line in Minutes with This Saddle Needle Valve (1 Pack)
The Evil that is the Saddle Valve: Remove at Once – Don Tai (Canada) Blog