Didn't know they existed until I was told by HD & L's that they no longer carry parts I was looking for. Went to Plumbing World and was holding parts I needed within minutes. Also noticed that they have a very good selection of faucets that are not available at HD & L's. Maybe its just a case of me not knowing to go to a plumbing store vs a hardware store. One thing I know for sure, I'll be keeping Plumbing World's address in my GPS. Don't forget to visit the burger stand next door!