Interesting, I've seen the pink stuff once (I think), but it's the white stuff that is plastered all over the Lowe's plumbing section. I did know that yellow was for gas though. Wouldn't it make more sense for them to promote the pink stuff, since it surely would be a higher ticket item, if it's the right one for the job?
Wouldn't just a few extra wraps make up for any thickness difference?
Okay, I figured it out. Pink is indeed the color coded higher density teflon for water use, but it isn't necessary to use pink for water connections. There's apparently green for Oxygen use, yellow is for gas, etc. The color code does apply to the thicker stuff, but not for 'standard thickness white' and for cases of oxygen or gas is required for that purpose, so as to ensure there's enough being applied. A couple extra wraps does suffice instead of using thicker teflon tape. The color doesn't indicate the thickness though, it's just a color code for application, the tape is either standard, high, or full density. So, unless it says otherwise, the pink tape is just as thick as the yellow tape, color doesn't necessarily differentiate them.