The Prince Lionheart Spill-Proof Cup Valve Cleaner is made specifically for Spill-Proof Cup Valves! Washes up to 11 valves at a time. It thoroughly sanitizes hard-to-clean spill-proof cup valves in your dishwasher. Dishwasher's water jets agitate and shake basket to throughly clean all brands of sippy cup valves. Shaker arm easily attaches to front or back of top dishwasher rack. Removable valve basket snaps on and off shaker arm.