Maintain the integrity and safety of your Mufan CO2 Regulator with the correct replacement O-rings. We offer two essential sizes: 1. Regulator to Cylinder O-Ring (200 Tk): This larger, thicker O-ring forms the critical high-pressure seal between the regulator body and the CO2 gas cylinder. Essential for preventing major leaks. 2. Bubble Counter Connection O-Ring (100 Tk): This smaller seal is used where the bubble counter screws into the regulator, preventing low-pressure leaks that affect bubble counting accuracy. Replace any worn or flattened O-rings immediately to ensure a stable, leak-free CO2 system.