Using this Bobrick toilet tissue dispenser is a breeze. First, open the dispenser using the provided tumbler lock key. Place two standard - core toilet tissue rolls inside, making sure they fit properly and are up to 5 - 1/8″ (130mm) in diameter. Close the dispenser with the flush lock to keep it secure. When someone needs to use the toilet paper, they can simply pull it from the dispenser. As for maintenance, keep the dispenser clean by wiping it with a mild cleaning solution and a soft cloth regularly. Check the lock periodically to ensure it's working properly. If you need to replace the rolls, just repeat the process of opening the dispenser and inserting new ones. Make sure to always use standard - core double rolls for the best performance. And remember, this dispenser is designed to be recessed, so install it in a wall with the correct rough opening size of 12 - 1/2″ W x 7 - 3/8″ H x 4″ min. depth (318 x 187 x 102mm).