Hello HomeDepotCustomer and thank you for the feedback you posted on the Home Depot website. We are sorry to hear of the difficulty you are experiencing with the Moen 100710 Posi-Temp Knob Handle Kit with White and Chrome Insert. Moen Knob handles are susceptible to breakage/damage when cleaning products are not quickly and thoroughly rinsed off the handle and this type of breakage/damage also occurs in areas with hard or high mineral water content. The Moen 100710 Posi-Temp Knob Handle Kit with White and Chrome Insert comes with a 1-year warranty. For Moen Posi-Temp tub/shower fixtures there is also a lever handle kit available to use instead of the knob handle, part number 100657. Moen product specialists are available for pre-purchase, installation, and warranty assistance. They can be reached at 1-800-289-6636 and are available Monday through Friday from 8:00 am – 7:00 pm Eastern Time.