I was told that as long as you tighten it down good it won't matter and that the pressure in the pipes help seal it. But then again, you may not want to listen to me because the only thing I truly know about plumbing are these 5 things:
1. Payday is on Friday, if you don't work through at least Thursday, you won't get paid.
2. Crap don't flow uphill.
3. The only way to prevent plumber's crack is to wear overalls.
4. A plumber's best friends are a plunger and a tetanus shot.
5. Don't chew your fingernails.
Now, on the other hand, if you use some turtle grease made from rendered turtle fat - yes, you can use your pipes right away!
HOOK 'EM!
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Since I am frequently asked about my religion on this site and others, I have created a profile that explains my beliefs. If you are interested in finding out more about my faith, please visit the link below:
http://mormon.org/me/6RNQ/