Teflon tape

The yellow tape is thicker.

Looked it up.

White- single density, should only be used on NPT threads up to 3/8 inch in diameter.
•Yellow – double density, often labeled as “gas tape”
•Red of Pink – triple density, required on all joints 1/2? or larger.
•Green – oil Free PTFE tape, required for use on all lines carrying oxygen (i.e. – medical oxygen or welding oxygen lines).

The yellow tape has more tensile strength, doesn't shread as easily as the white and it seals smaller imperfections in pipe threads than the white. I could use white tape on a joint and have it not leak at 300psi with water, but the same joint might leak with only 50psi of air/gas.

Bruce

I have to ask you guys, in what direction do you wind on the tape. clock wise or counter

Wind it so that tightening the connection will not unwind it.

I've always been told wind tight and clockwise looking at the end of the threads

wd wrote:
I've always been told wind tight and clockwise looking at the end of the threads

This is correct. It is easiest to roll it backwards off of the roll, pressing on the end with your thumb, wrapping it clockwise. The first three threads and two to three wraps are the most important to cover properly, then the rest, up to the last thread, can be done with less care.

Bruce

The first time you pay an RV service place to pull little pieces of yellow teflon tape out the orifices on your furnace, water heater or cook top, you'll stop using tape and go to something like Loctite teflon dope.

So if a person didn't want to concern himself with whether to use white or yellow tape even though the applications are quite apparent( I'm a bit anal and want to keep things simple but also use the best) then I could just use yellow tape for water and/or gas applications? I'm aware that one should not use too much tape which could compromise the sealing of the threads.