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3 -5 turns DEPENDING on the thickness of the tape as cheap tape can require up to 8 turns or more
Pipe dope and/or teflon tape
Many fittings, except unions, require the use of teflon tape.
Not necessary, but recommended along with pipe thread compound.
You do not need tape on any flared fitting, brake or regular. The brake line and the fittings are different size and thread type than regular copper line and fittings. You can't mix them.
pipe dope and teflon tape
3 -5 turns DEPENDING on the thickness of the tape as cheap tape can require up to 8 turns or more
With a wrench
If you are running natural gas or propane, gas teflon tape. Otherwise, any white teflon plumbers tape is fine.
Teflon tape only, no joint compound. Two or three wraps is plenty... Yes agreed, teflon tape will make it easier for repairs in the future
Pipe joint compound or Teflon tape
Pipe dope and/or teflon tape
Pipe dope better solution than tape.
No, teflon tape is not sticky and that's for a good reason. -Most people think of teflon tape as a sealant. However it was originally intended for plumbing use as a sealant AND a lubricant so you can get a tighter connection on the pipe joint.
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.
Teflon tape can be used on any type of liquid joint. However, it is strictly speaking a lubricant, NOT a sealant, and is a cheap and nasty way of sealing joints. - The proper sealant for any liquid pipe joint is a pipe joint compound such as Whitlam's or Oatey's Blue Joint Compound.
Nothing, as long as you don't have tape over end of threads.