O-ring X - La Piccola
Every espresso machine uses O-rings to seal the low-pressure hydraulics. The O-ring is placed underneath the heat exchanger to prevent leaking. Therefore, it is one of the most important sealing components of a coffee machine.
An O-ring is a donut-shaped seal that is most commonly used to stop fluids or air passing through into another area. They are normally seated between two sections and when compressed, they form a secure seal that prevents particle, vapor, and fluid leakages, which in turn protects and maintains pressure whilst keeping debris out, ensuring proper function and safety.