teflon tape

I would unless you want leaks.....Most of the pvc threaded pieces will have imperfections along the threads that will cause water to leak without using the tape....Unless it is a section that you need to be able to remove from time to time I would also glue it...unless you are talking about something like unions...most unions you can get by without tape because of the rubber o-rings but I still use tape just for that added assurance
 
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