Terms of the Trade: What Is Plumber's Putty? Terms of the Trade: What Is Plumber's Putty?
Plumber's putty is a sealant used in plumbing applications to protect areas that may be exposed to unpressurized water to prevent leaks and water seepage. It's usually applied to areas around drains and faucets, and is a staple in any plumber's tool kit. It's made of clay and is pliable, making it able to create a watertight seal.