Parallel and tapered thread
Parallel and tapered threads require different sealing solutions. When the female thread and the male thread are both parallel an o-ring or bonded seal is often used. O-rings are one of the most common seals, because they are inexpensive, easy to make, reliable and have simple mounting requirements. When the male thread is tapered an o-ring seal can’t be used, because the thread can only be screwed in only partially.
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