How do I fill the rinse agent dispenser?

Fill the rinse agent dispenser until it reaches the bottom of the lip inside the opening, then replace the cap. A full dispenser should last about one month. To check if rinse agent is needed, remove the cap and look into the dispenser, or on some models, press the clear center of the fill cap 2 or 3 times—if rinse agent fills the center, you have enough.