You use it on the pipe that the union is connected to, but not on the threads of the union itself. The union seals where the two halves join and there is no liquid or gas in contact with the threaded part of the union.
Only apply thread sealant to the MALE threads of the pipe.
Pipe dope better solution than tape.
they rust
No, teflon tape (and pipe dope, for that matter) should never be used on flare fittings. They are designed to seal without tape or dope, and may actually leak if tape or dope is used.
Welding, Brazing ,threading with Teflon tape (unless it is gas)
pipe dope and teflon tape
Trey sharkbite coupler if it is on a straight pipe. Use a good pipe cutter the size of your pipe. Plug in the coupler. It does not require any soldering. Check for the you tube video.
Trey sharkbite coupler if it is on a straight pipe. Use a good pipe cutter the size of your pipe. Plug in the coupler. It does not require any soldering. Check for the you tube video.
The best method for sealing pipe joints is using Teflon tape.
when joining to lengths of black steel it is necessary to use either Teflon tape or pipe dope, also called leak lock, this is not to seal the joint per say but the tape and doping act as a lubricant on the threads of the joint allowing for the pipe to be turned together tighter also the dope will dry and become a sealant
With a wrench
Both Teflon tape and pipe dope are effective methods for sealing pipe joints. Teflon tape is easier to use and less messy, while pipe dope provides a more secure seal. The best method depends on the specific application and personal preference.
Pipe joint compound or Teflon tape
By use of male or female, teflon paste or tape or leak block and then use A COPPER X MALE OR COPPER X fEMALE ADAPTER
Typically, 3 to 5 wraps of Teflon tape should be used when sealing pipe fittings.
Pipe dope and/or teflon tape