O-ring SCHAERER Spare Parts 3370073223

An O-ring creates a seal between two surfaces that must hold liquid or steam under pressure. It sits in a groove, compressed when the parts are tightened, so that the material fills every gap and prevents leaks. In coffee equipment, O-rings keep water and steam inside the brew group, boiler and valve assemblies where pressure builds during extraction. Without a seal that withstands heat and repeated flexing, the machine loses pressure, drips or fails to reach the temperature needed for espresso.

The operator removes the worn O-ring with a pick or flat tool, cleans the groove of any residue, and presses the new O-ring into place. Once the mating parts are reassembled and tightened, the seal is restored and the machine can resume service.

This O-ring is manufactured to the exact dimensions and material grade specified by SCHAERER for its coffee machines. The cross-section and internal diameter match the original part, ensuring a tight fit without over-compression or distortion.

It fits SCHAERER coffee equipment that uses the 47.22 mm internal diameter and 3.53 mm cross-section seal profile.

The catalogue lists it under Coffee Machine Spare Parts, Seals and Gaskets.