Apex Ultra Safe Refrigerator Water Line Connection and Ice Maker Installation Kit for Feed water line Connects APEX systems to refrigerator ice makers for crystal pure water superior to fridge water filters. Qonnects APEX systems to refrigerator ice makers for crystal pure water superior to fridge water filters. Kit includes NSF certified 20 feet 1/4" Tubing, 1/2" x 1/2" x 1/4" feed water adopter, and a compression fitting set. Tested by independent third-party to meet NSF/ANSI Standards. Connects to feed water line to the ice maker or water dispenser of your fridge.