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Is it OK to glue threaded (NPT) connections? I got some threaded unions when I wanted slip, and it seems like it would be more secure and leakproof if it was glued.
I would think you'd be asking for trouble doing that... If you don't have glue in all of the threads you're going to get a leak somewhere and then you won't be able to tighten it. Also, there's probably only so much you can tighten it before the glue would set. You'll be ok with the threaded unions. You may even find you like them better than the slip!
FWIW I use the teflon tape on my skimmer pump and return pump. I haven't had any leak issues with it. Just be sure to wrap the tape in such a way that when you thread it, it doesn't start to unravel.
That glue dryes fast and I would be afraid of not getting it threaded all the way before the glue will dry on you! I used teflon on all my threaded fittings and it worked great EXCEPT when you overtighten it! (They will crack!) :0
The Teflon glop you are speaking of is the best. It is not a glue, just Teflon tape in a liquid form. It fills the gaps better and the threads screw on easier.
Talk about being "tunnel visioned". I'm in the pipe isles way more then I want to be and have never seen it. When I make a run there today it will probably reach out and slap me silly.
It's kind of messy and it never dries. I'm wearing gloves next time I ahve to use it. I bought it because the Sequence Dart pump instructions specifically say to use it rather than teflon tape.