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Hello Valued Customer, Thank you for contacting Delta Faucet Company! Please refer to the information below to replace your DST valve cartridge. I apologize again for any inconvenience this may cause. Please shut off the water supplies, and gather your 1/8" allen wrench, wrench, and strap wrench before we begin. Check your model's parts diagram for the correct part number. Common cartridges include RP50587, RP73000, or RP60114. 1. Shut off the water supplies. 2. Cover the drain opening so parts don't fall into it. 3. If you have a lever handle with a red and blue hot/cold button, pry it off with a non-metal object to expose the set screw. A library card works well. 4. Loosen the set screw with a 1/8" hex wrench and remove the handle. 5. Unscrew the trim cap counterclockwise and lift off. Some caps just lift off if unscrewing has no effect. 6. Remove the bonnet nut with an adjustable wrench by turning it counterclockwise. Be careful - the bonnet nut may have sharp edges. 7. Remove the valve cartridge, making sure the bottom gasket comes out with it. 8. Inspect the valve cartridge for debris. 9. Install a new valve cartridge, aligning tabs on its bottom with divots in the valve. 10. Place the bonnet nut over the cartridge and align the threads. Be careful - the bonnet nut may have sharp edges. The spout may need adjusting to get threads lined up. 11. Tighten the bonnet nut with an adjustable wrench watching that the cartridge does not shift. Tighten to about 10 pounds of force on a 10" adjustable wrench. 12. Replace the trim cap. 13. Replace the handle, lining up the set screw with the flat on the cartridge stem. 14. Replace the set screw cover, if you had one. Uncover the drain and turn the water supplies back on. We appreciate your inquiry. Please reach out directly if you have further questions! Best Regards, Kyra Digital Communications Specialist