The S-Shaped Airlock is a must-have tool for homebrewers and winemakers, designed to safely release CO2 during fermentation while keeping contaminants out. Fill the airlock with sanitizer or neutral alcohol, then insert it into a drilled stopper to create a sealed, pressure-relieving system. The distinctive twin-chamber design provides clear visual cues of CO2 activity, allowing you to easily monitor the progress of fermentation. Its compact structure minimizes the risk of liquid backflow, especially useful when cooling your fermenter, ensuring a clean and efficient fermentation process. Ideal for both primary and secondary fermentations.