Following the suggestions on this site, I bought a 1/4" compression cap for the unused icemaker water line under the sink. After installing it with Teflon tape, water is still spewing out. I noticed that the icemaker line I removed has a male piece that plugs into the supply line and then a female nut to tighten it to the line. Is there a cap that would have such a piece that would go into the line to improve the fit?
Plumbing – How to Cap Icemaker Water Line Under Sink to Prevent Leaks
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Related Solutions
The easiest way to achieve what you are looking for with what you already have is to:
- Shut off the water at the angle stop shown in your first photo (confirm that the valve is closed by opening the cold on you sink)
- Cut the copper tubing in half (the tubing between the angle stop and the second valve)
- Install the valve tee shown in your second photo (this will reconnect the cut tube)
- Test (by opening the angle valve)
- Slowly tighten the compression fittings if they are leaking
Here's a video on how to install compression fittings: Youtube video.
You're going to need to get a 3/8" x 3/8" x 1/4" brass tee, like this one from Home Depot.
Then you'll simply screw the tee onto the male end of the shutoff valve (where the cold water supply line should currently be attached). Attach the supply line (that you removed from the shutoff valve) to the male end of the tee. Finish the installation by attaching the tubing to the 1/4" outlet using a compression fitting (Which should be included with either the filter or the tee).
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Best Answer
So at the end of tubing that you want to cap you should have a fitting similar to this
Additionally, add insert one of these into the tube after the nut and compression ferrule have been placed on the tube
using directions as mentioned for nut above.
Tighten the nut onto the couplers body only until the bottoms out or stops turning. Brass nut will crack from over-torquing. Remove the other nut and ferrule from the couplers other end. Wrap (2) turns of teflon tape in a clockwise direction on these threads. Tighten a compression cap
Compression fittings have a "finer" thread than standard International Pipe Thread (IPT).