EL
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PET
The standard thread that is found on almost all PET bottles that you buy. In recent years, the thread has also become popular among home brewers thanks to its great flexibility. The strong threads makes the coupling durable to withstands many unscrews and screws.
Several designs can be found with different numbers of turns on the threads, but as a rule it works well as long as the threads on the male are longer than the female.
