Compression Tube Fittings
Fittings and Adapters
Can you use Teflon Tape or Pipe Dope with Tube Fittings?
Generally, it is not recommended to use Teflon (PTFE) tape or pipe dope with compression tube fittings. PTFE Tape and pipe dope are meant to be used on hydraulic fittings where the seal is created on the threads. With tube fittings, the seal is created on the ferrule. In some cases, if too much tape is used, the tape can prevent the compression nut from screwing down far enough to create a seal. Stray bits of tape or lumps of pipe dope can also get lodged on the sealing surface of the tube fitting which can cause leaks.