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This question already has an answer here:

This may sound silly but after a few home improvement projects involving minor plumbing tasks (like changing faucets) this has always bothered me.

I'm going to talk about the specific example of an angle valve since it's the one I've faced more often, but this could apply to any kind of plumbing accessory that you twist on until its tight.

I've included an image below of the kind of thing I'm talking about in case the translation I googled is off.

In Europe at least, usually you have a shut-off valve like the one in the picture on every water point in the house. In my case, in the house I moved in, I had some very crappy ones with plastic handles that broke with time and didn't serve their purpose anymore (you couldn't use them to shut the water without using pliers)

When installing the replacement it bothered me that I could not get it tight and pointing to the direction more convenient to then connect it to the appliance/faucet.

Logic seems to dictate that it's however the ridges/groves align between the female point on the wall and the valve's male connection but it's weird for an amateur to see that such a detail would be left to luck or expecting that the female point on the wall was mounted with any intention regarding ridges or what will connect to it.

When I faced this, first I tried starting to twist at different points but found that they only engage at very specific points which makes sense and shows the same result (or same 2 results in some cases) no matter where you start. Then I thought just to tighten it to the maximum then go back enough until it's in the position I want it to be, but even when properly using Teflon tape around the grooves I've found that it needs to be absolutely tight to not have any sort of leaks.

Is there any trick to it?

test

marked as duplicate by isherwood, Community Jan 29 at 19:37

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It isn't a game of chance. A few wraps of PTFE (Teflon) tape give you the flexibility to stop at an appropriate angle. The characteristic compressibility of the tape means you don't have to bottom the joint out to make it seal.

If you find that the joint bottoms out before it feels snug enough, start over. Remove the used tape and apply a few more wraps than last time.

  • Thank you for the link to the other answer. On the actual cases of angle valves, I think I've never trusted the PTFE enough to not make it as tight as I can and go turn on the main water valve. There were a couple of cases when I was using brass elbows/Tee and because I had a shut-off valve right there, I tried great amounts of PTFE (I'm talking wrapping 10 to 20 times) but it still leaked. I'm starting to suspect that I can't trust mixing fittings from different brands/stores and expect them to not leak. Thanks! – Manuel Silva Jan 29 at 19:41
  • Yeah, fitting quality is a factor. You can also use PTFE paste, which obviously can be applied more thickly. – isherwood Jan 29 at 19:44

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