What this O-ring does

On later la Pavoni lever machines, the brew group is held to the boiler with two bolts. Hot water passes from the boiler into the group through that joint, and this O-ring sits in a groove behind the group flange to keep it sealed under boiler pressure. The earliest Europiccola models, where the group screws directly into the boiler, use a different arrangement and do not take this O-ring.

Signs it needs replacing

The typical symptom is water or steam escaping where the group meets the boiler while you brew. Rubber seals harden and flatten over time with heat, so a ring that looks squashed or cracked is worth replacing whenever the group is off anyway, for example when you change the piston seals.

Fitting it

Switch the machine off, let it cool completely and make sure there is no pressure left in the boiler. Undo the two 10 mm bolts that hold the group to the boiler, lift the group away and pick the old O-ring out of its groove. Clean the groove and the boiler face, then seat the new ring with a thin film of food-safe grease such as RS PRO Silicone Grease, which helps it sit evenly and makes the next service easier. Tighten the two bolts evenly so the group sits square against the boiler.

Specifications

What’s in the box

• 1 x la Pavoni group to boiler O-ring (754132955)