The Bradford White 415-49560-08 Anode - A420 Aluminum, with a 3/4 inch NPT connection, serves as a crucial component in HVAC systems, particularly in water heaters. This device serves as a sacrificial anode, preventing rust and corrosion by corroding in place of the metal surface of the tank. https://www.partshnc.com/415-49560-08-bradford-white-anode-a420-aluminum-34--npt