# Gaggia Group Gasket (Classic, black rubber 8.5mm)

> Espresso compatibility data from EspressoFit. Confidence: **manufacturer (Tier 1 — manufacturer primary source read firsthand)**.
> Sources last read firsthand: 2026-07-13.
> Canonical page: https://espressofit.com/parts/gaggia-classic-group-gasket/

## Specifications

- **Part type:** Group gasket
- **Fits group:** Gaggia Classic group (EF0030A boiler)
- **Brand:** Gaggia

## Fits these machines

- Gaggia Classic Pro (E24) (58mm portafilter) — https://espressofit.com/machines/gaggia-classic-pro/

## Notes

The group gasket (grouphead seal) is the rubber ring seated inside the
grouphead that the portafilter clamps against to seal under brew pressure. It
is a **wear part** — as it hardens and compresses with heat and use, the
portafilter starts to sit slack or the group weeps during the shot, which is
the classic sign it is due for replacement. Unlike baskets and portafilters,
a gasket is keyed to the grouphead, not the portafilter diameter, so it is
matched by machine/group rather than by a 58mm-style standard.

Gaggia's own part is "8.5 mm thick and made of black rubber," and Gaggia states
it fits "the Gaggia Classic Pro and all semi-automatic espresso machines with
an EF0030A boiler" — so it is cross-referenced to the Gaggia Classic Pro here
(Gaggia's part number 11004543). It does not fit the pressure-profiling or
lever machines in this database, whose groupheads seal differently. Verified
against Gaggia's official parts page on 2026-07-13.

## Sources

- https://www.gaggia-na.com/products/gaggia-classic-baby-evolution-group-gasket
  - Official Gaggia North America product page, read firsthand 2026-07-13. States verbatim: 'A replacement group gasket compatible with the Gaggia Classic Pro and all semi-automatic espresso machines with an EF0030A boiler. This gasket is 8.5 mm thick and made of black rubber.' Part Number: 11004543.

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Compatibility reference, not a substitute for your machine's manual. Every claim above cites the source it came from; see https://espressofit.com/methodology/ for how entries are verified. Corrections: corrections@espressofit.com.