Garmaine Staff asked 2 years ago

I am trying to connect an under counter Reverse Osmosis ( R.O. ) filter inlet line (red 1/4" tubing) to the cold water supply line (3/8" black tubing in picture) under my kitchen sink.

Can anyone help me figure out what sort of Tee/adapter fitting I need to get this done?

Obviously I still need the black cold water supply line to feed the sink faucet as well as this red R.O. Filter inlet line.

I also want the shut-off valve to be in the line to the R.O. filter.


enter image description here

RO inlet

Additional pictures here showing sizes of connections: