"Galvanized pipe" refers to a type of pipe that has been coated with a protective layer of zinc. This coating helps to prevent rust and corrosion, making the pipe more durable and long-lasting. Full definition
Sometimes you can get away with leaving the galvanized plumbing, but galvanized pipes tend to corrode, which seriously reduces water pressure. (biggerpockets.com)
I had a client who had to re-plumb half of a duplex at a cost of almost $ 5000 because there was a leak in the slab because it was old galvanized pipe whereas the other half of the unit had new copper. (biggerpockets.com)
Some residential properties in New York City still have galvanized pipes for the inlet water line. (law.stackexchange.com)