On Tue, 17 Jul 2012 18:41:23 -0400, mcp6453 wrote:

I have to remove a toilet. It's the first time I've done it. How do I
know which wax ring to buy at Lowes? Any tips to keep me out of trouble?

http://goo.gl/PCzaB

I like these better than wax rings:
http://www.fernco.com/plumbing/wax-free-toilet-seal

I buy them at Ace Hardware.