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This is a replacement boiler O-ring seal for the 9Barista Mk.1 espresso machine. This will not fit the Mk.2. It’s a key part of the machine’s pressure system, designed to maintain a tight seal between the boiler and upper chamber during brewing.
Made from high-quality, food-grade silicone rubber, the O-ring is durable, heat-resistant, and safe for long-term use in high-pressure environments. Under normal operation, the original seal should last for years. However, if it becomes damaged due to overheating, wear, or accidental pinching during assembly, a replacement may be needed.
Installing a new boiler O-ring helps ensure your machine stays leak-free and delivers consistent pressure for perfect espresso shots. It’s easy to replace and does not require special tools.
Material: Silicone rubber
Internal diameter: 55mm
Cross section: 2mm
