1. No Drip: The Flow Filter Cap stops drip through, giving you full control over your brew time. Now you can let the grounds brew for however long you want before pressing. 2. Valve Design: The unique design of the Flow Filter Cap is based on a pressure-sensitive valve that remains closed until you choose to press your coffee. This method allows for a longer brew time, giving you more intense flavors. 3. Compatible: This cap fits perfectly on Original, Go and Clear coffee makers and can be used with metal and paper filters. Now you can create hundreds of recipes by experimenting with grind size and brew time. Not compatible with XL coffee maker. We do not recommend using the Flow Control Filter Cap on Original coffee makers made before 2014 due to a change in material that may affect the fit of the Flow Control Filter Cap. 4. Filter Flexibility: Try it with the stainless steel reusable filter, an paper micro-filter, or even both at once for endless flavor possibilities. To clean the Flow Control Filter Cap, simply rinse it with water. For a more thorough cleaning, clean the top rack of your dishwasher.