Group gaskets

A group gasket (grouphead seal) is the rubber ring that seals the portafilter against the group. It is a wear part keyed to the grouphead design, not the portafilter diameter, so it is chosen by machine or group standard rather than by basket size.

These fit by grouphead rather than portafilter size — see groupheads explained.

By grouphead (3)

These fit by grouphead rather than portafilter size.

• Breville Shower Head Seal 54mm (SP0025526) — Breville 54mm group verified
• Breville Shower Head Seal 58mm (SP0001635) — Breville 58mm group verified
• Gaggia Group Gasket (Classic, black rubber 8.5mm) — Gaggia Classic group (EF0030A boiler) verified

How these entries are sourced

3 group gaskets are listed here, 3 of them backed by a manufacturer document read firsthand. A part appears under a machine only when a maker's own documentation names that machine or states the dimension it is built to — we do not infer a fit from two numbers matching, and where a maker is silent we leave the gap visible instead of filling it. See how we verify compatibility.

New to sizing? See espresso portafilter sizes explained, or browse all part types.