3/8" Tube x 7/16" uns Female Threaded Adapter used with RO faucet ( 59JGCI3212U7S ).
Recommend using 3 wraps of Teflon tape when screwing this adapter to the metal threads of the faucet.NOTE: This is for use with water lines that are 3/8" O.D., and not the older style 1/4" O.D. water feed lines.
Information on Removing and Connecting the Tubing using Quick Connections,
see: How to Use Quick Connect Fittings - Video