Using the Bobrick B - 828 soap dispenser is easy. Just wave your hand under the dispenser, and it will release the right amount of foam soap. For cost - efficiency, use universal bulk liquid soaps. When it's time to refill, simply open the top - fill design and add more soap. During installation, whether it's a new one or a retrofit, make sure the mounting hole is 1 - 3/8” (35mm) in diameter. If needed, you can enlarge the opening with an appropriate hole saw. For maintenance, clean the dispenser regularly to keep it in good working condition. This will also help maintain its chrome finish and keep your washroom looking great.