plumber in last week-toilet running and water bill up from $32 to $149 in short while. My husband cut the water off when we got water bill to it. The plumber replaced the long cylinder. Problem solved. $60 a good price.he said the flappers will go bad next so we need 3 flappers as we replaced all 2018 as delta a good product. We probably need 2 more cylinders in tank too as already the other cylinder running and my husband adjusted it. Thought parts guaranteed but parts not very good. If i have to pay for 2 cylinders and 3 flappers i will as better than $149 water bill I pay next week. Let me know. I registered them.