Here are some frequently Asked Questions about compression fittings.

Q1."Should I use PTFE thread sealing tape or pipe joint compound on my compression threads?" 
A. No, you definitely should not. PTFE tape and pipe joint compound (also known as "pipe dope") should only be used on "IPS" ("iron pipe size") threads, which are normal pipe threads. IPS threads make their seal along the threads themselves; when a piece of IPS-threaded pipe is screwed into a fitting, PTFE tape and/or pipe dope is use...

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