I'm trying to replace a kitchen faucet, and am replacing the hot and cold supply lines also. I've got the stainless steel supply lines to replace the old ones. Should I use teflon tape when connecting the new ones? Or plumbers putty? What is the difference? What happens if I don't use anything?
Plumber's putty is a putty or clay like substance. Teflon tape is usually a thin white flimsy tape. Both are used to seal things to keep them from leaking, but in different ways.
Use teflon tape on the threaded connections. Wrap it so that when you're tightening the nut, it pulls the tape tighter, not looser. When you tighten the connection, it fills the voids between the threads to keep water from seeping through there.
Use plumber's putty underneath the faucet body when you put it onto the sink. It helps seal under the faucet to keep water from running under it and dripping into the cabinet inside. Usually you roll it between your hands and make a rope or snake of it, and position it at the edge of the faucet body. Then when you tighten the nuts, some squeezes out. Scrape away this part and toss it in the trash. What remains will seal the faucet.
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