Various Thread Types of Plumbing

A Compression TeeA common exchange within the average hardware store:

Customer: I need a new supply line for my kitchen faucet.

Employee: Very good. Do you know what type of threads were on your old one?

Customer: I think they were just the "normal" threads.

Such are the common mistakes made by a great many DIYers who have not had any real plumbing experience. The problem here is that there are no "normal" threads in plu