Hello Glenn and thank you for the feedback you posted on the Home Depot website regarding Moen Soap/Lotion Dispenser in Chrome model 3944. Most of our dispensers are meant to be installed with the underdeck parts, bottle etc. They are not always interchangeable. If you need warranty assistance or have questions, please contact our product specialists. They can be reached at 1-800-289-6636 and are currently available Monday through Friday from 8:00 am – 7:00 pm Eastern Time.