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1victorianfarmhouse 09-06-2011 10:51 PM

Leaky Pipe Threads
For many years on threaded items that pass liquids (brake fluid, coolant, engine oil) in cars, trucks and motorcycles, I've used a pipe thread sealant with TFE to lubricate and seal the threads. I've also had good success using on home plumbing.

Now I find myself with a few newly installed NPT fittings that leak a little here and there despite my careful prep and tightening. I tightened them pretty good, without over tightening them, as there were already pretty tight. Making them tighter (afraid to crack it), they still leak.

Am I doing something wrong or using the wrong pipe sealant?



Redwood 09-07-2011 10:32 AM

I use a belt and suspenders method with good results....

Apply teflon tape then teflon paste over the tape....

1victorianfarmhouse 09-07-2011 08:52 PM

Thanks, Redwood. Guess it's not me then!

I used to use teflon tape until I discovered teflon paste.

I wonder if the quality of the fittings has slipped over the years? I get them from the smaller hardware stores and the big boxes (Home Depot, Lowes, Menards). I think they are pretty much all made in China or Mexico.


Redwood 09-07-2011 11:22 PM


Originally Posted by 1victorianfarmhouse (Post 60812)
I think they are pretty much all made in China or Mexico.

Low Quality Imports???? Never! :rolleyes:

If that fails you can always put wicking in the thread grove....

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