I am a skilled professional that works for a Dor-Mar Heating & Air Conditioning company. I was called out to a client's home to inspect a water heater that was leaking. Upon inspection, I noticed that the cold intake nipple had corroded and broken off. I replaced the nipple with a new one and a new brass tee and expansion tank. I waited a little longer to inspect it to ensure we did not have any water come up and leak. I turned the water heaters back on before I left. The client will have hot water within the hour. We are good to go.