O-ring LF L1786197

An O-ring is a circular seal that sits in a groove between two mating surfaces to prevent leaks of water, steam or hydraulic fluid. In espresso machines, it is compressed when the two parts are tightened, creating a pressure-resistant barrier that keeps the system watertight under the high temperatures and pressures of coffee extraction. The material, FKM (fluorocarbon rubber), is chosen for its resistance to heat, oils and the acids found in coffee, so the seal does not harden, crack or swell during continuous use.

This green FKM O-ring is installed wherever the machine manual specifies part number 03030. The operator removes the worn seal, cleans the groove of any residue, places the new O-ring in position, and reassembles the joint, ensuring the ring is not twisted or pinched. Once the machine is repressurised, the seal is tested for leaks before the machine returns to service.

The O-ring is a single-piece moulding in green FKM, a material that remains flexible across the temperature range of espresso brewing and steaming. It fits the listed models of CASADIO, CIMBALI and FAEMA machines, where it is used in brew groups, solenoid valves, steam wands and hydraulic circuits.

In practice, the absence of any specified dimension means the O-ring is supplied to the exact size required by the original equipment manufacturer. It is a direct replacement, not a universal part, so it matches the groove depth and width of the specified machines without adjustment.

Cleaning is limited to the groove before installation: wipe it with a lint-free cloth to remove old sealant or scale. The O-ring itself is not cleaned with solvents, as FKM can be damaged by some degreasers; warm water and a soft brush are sufficient if any residue is present.

This is the standard green FKM version of the O-ring 03030. No other colours or materials are listed for this article number.

Fits CASADIO coffee machines: DIECI (from 201001), DIECI (2019), DODICI (from 201012), VENTI (from 201012). Fits CIMBALI coffee machines: M24-COMPACT, M24-SELECT, M39TE-CLASSIC, M39TE-DOSATRON. Fits FAEMA coffee machines: E61-LEGEND, EMBLEMA-A, EMBLEMA-RESTYLING-A, EMBLEMA-RESTYLING-S, EMBLEMA-S, ENOVA-A (from 200706), ENOVA-RESTYLING-A (from 201002), ENOVA-RESTYLING-S (from 201002), ENOVA-S (from 200706), PRESIDENT, PRESTIGE, TEOREMA-A (from 201404), TEOREMA-S (from 201404).

Catalogue placement: spare parts for espresso machines, seals and gaskets.