I want ot install a 'semi permanent' outdoor sink on the exterior wall where my kitchen is. i have the standard hot/cold stub-outs with right angle shutoffs under my kitchen sink. I want to drill holes (oh no! 😥 right thru my exterior wall and somehow connect to my hot/cold lines). I envision some kind of threaded nipple stubouts that stick out of the exterior wall that i can thread on the standard braided type flex lines that would connect to that exterior sink/tub.

I want to be able to turn off the flow to those exterior lines from inside the house... so I wanted to have 1/4 turn valves or something like that under the interior kitchen sink. I dont want ot violate codes while im doing this also. I live in an area where pipes down freeze. there also isnt a ton of space in the cabinet under my kitchen sink

i would appreciate some suggestions. e.g. i was thinking about have solid copper pipe (with a 90 elbow) on the back vertical wall of my " under kitchen sink cabinet" and that 90 elbow runs thru the exterior wall to threaded "nipples' that sticks out 1 or 2 inches. the question is how to make all these connections under my kitchen sink. I could go in my crawl space and run another set of hot/cold lines up the vertical wall and have 2more stubouts under the kitchen sink that are dedicated to the exterior sink but that might be over kill? I could also replace the current 90deg angle stops with ones that have an additonal output port and then run those somehow to another set of 1/4 turn inline valves that then go thru the exterior wall to outside sink.?

 

I would T the ends of your hot and cold water lines inside the house. One side would go to your sink as they are now. The other side of the T I would install 1/4 turn ball valves on each line and route the water lines outside with a slight downward slope. Then put the standard shutoffs on the end. Then in winter you can detach the hoses from the outside shutoff valves. Close the interior ball valves. Then open the outside shutoff valves to drain the lines so they don't freeze.

 

Pilot Dane thanks . i like the idea of running the lines that go exterior on a slight downward slope.
however... i need to decide if i want copper pipe (1/2" or 3/4" ) to be runnign on the interior wall under my kitchen sink ?
1.normally all water pipe is behind sheetrock
2nipple protrude thru sheetrock and 1/4 turn valves are installed
3flex braided supply lines run from the nipples to the faucet and/or dishwasher. these supply lines just kind of flop around,
4 for my exterior line ... would copper pipe come off of that "T" and an inline 1/4 turn ball valve sweated in... this would all be fixed onto the back wall under my sink?
thx

 

For just a sink 1/2' lines is sufficient. You probably have 1/2" lines in the wall feeding the sink.

 

How about this?

Connect the cold feed under the inside sink to the "down" of a tee mounted (suggested) down-left-right.. Put shutoffs on both left and right of the tee. Connect left to the inside sink. Run the right outdoors through the wall and elbow down (must be down) to the "up" of a tee mounted (suggested) up-down-out beneath the outside sink. Connect the "down" to another shutoff, also under the outside sink, leaving the other end of this shutoff unconnected. Connect the "out" to the outside cold sink faucet.

Repeat for the hot.feed.

Now you use the inside shutoffs as the repair shutoff and also the winter shutoff for the outside sink. The outside shutoffs are used only for draining the exterior piping avoiding the need to unhook the flex connectors going to the outside faucets which repeated unhooking and rehooking can get tedious during spring and fall with warm days and sub freezing nights.