In 2019 I had a contractor replace my shower and bathtub faucets with Delta products. I kept the work order that had the part numbers. One started to drip last year and the other just a few months ago. I contacted Delta and provided them with a copy of the work order, and they sent me new cartridges because they warranty their products for 10 years. I replaced each one after shutting down the entire house (there aren’t any dedicated shut off valves for the shower or tub) and did the work myself in about 15 minutes.
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