Easy mouth rinse tooth brushing fountain. Pull on the sides to activate the fountain no need to plug a hole. But for those you love sticking their fingers in holes a simple version has been provided.An o-ring was originally designed to be placed at the bottom, but it functions without. Simply press mid and outer together, they lock in place. Happy Mouth Rinsing!Note: Fits a 24mm to 25mm faucet head. Some sanding or tweaking maybe needed depending on the printing.http://www.youtube.com/watch?v=4qzQXkf65DQ&t=0m29s