AeroPress Flow Control Filter Cap - StandardAeroPress Flow Control Filter Cap: Take Control of Your Brew Unleash your inner coffee scientist. The AeroPress Flow Control Filter Cap replaces the standard cap with a pressure actuated valve that stops drip through and gives you complete command over your brew. That means more flexibility, more creativity, and more flavorwhether youre dialing in a cold brew, going bold with a long steep, or aiming for espresso style intensity. What is the AeroPress