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Hello Valued Customer, Thanks so much for contacting Delta Faucet Company! To remove the RP101504 stem unit, please refer to the instructions below! Please gather an adjustable wrench and a towel for excess water. 1. Turn off water supplies, and then turn the handles to the open position to release excess water. Turn it off for proper stem orientation. 2. Remove handles by hand turning the handle base counterclockwise. 3. Remove the bonnet nut with the adjustable wrench. 4. You will expose the brass stem units. Please take a photo or take notes on how these are oriented. 5. Replace in reverse order Please reach out with further questions! Best Regards, Kelley Digital Communications Specialist

Hi Jc84, Thank you for contacting Delta Faucet Company! To remove the RP101504 stem unit, please refer to the instructions below! Please gather an adjustable wrench and a towel for excess water. 1. Turn off water supplies, and then turn the handles to the open position to release excess water. Turn it off for proper stem orientation. 2. Remove handles by hand turning the handle base counterclockwise. 3. Remove the bonnet nut with the adjustable wrench. 4. You will expose the brass stem units. Please take a photo or take notes on how these are oriented. We appreciate your inquiry. Please reach out directly if you have further questions! Best Regards, Kyra Digital Engagement Specialist

Hi Michael, Thank you for contacting Delta Faucet Company! We apologize this information was not readily available to you and we are happy to help! To change the stem units (RP101504) on your B3511LF-PPU-ECO faucets, please refer to the instructions below! We recommend flushing the faucet before installing new stem units. Please also note to turn both hot and cold water off before removing parts. 1. Remove the handle with a 3/32" Allen wrench. 2. Please pull the handle off of the stem unit. 3. Remove the bonnet nut with your adjustable wrench. 4. Before removing the rest of the parts, verify the orientation of the stem and lift straight up to pull the stem units out. 5. Look into the valve, you should see a seat and spring. Please pull these pieces out before flushing. 6. Place a towel around the back of the entire faucet, and place the bucket on top of the towel to catch excess water. 7. Have someone turn the cold water supply on for about 30 seconds to a minute. After this, shut the cold water off and move the bucket and towel to the hot side, flush that out as well. You may be able to do both at the same time if the bucket or bowl fits over the handles. We appreciate your inquiry. Please reach out directly if you have further questions! Best Regards, Kyra Digital Engagement Specialist