The extra brush head is constantly getting knocked onto the floor. It sits loosely on a peg with nothing to secure it to the base.
Response from waterpik.comBy WaterPik, Product Support, March 30, 2022
Hello Clint - The SF-04 comes with a magnetic brush head storage post. It magnetizes to the right side of the unit and can store additional brush heads. If you have any questions or need assistance, please contact us at 1-800-525-2774.