The shower-head seal (group gasket) on Breville’s 58mm machines — the Dual Boiler, Oracle and Oracle Touch — is the silicone ring that seals the portafilter and shower screen against the group under brew pressure. As it hardens and compresses with heat and use it stops sealing: the portafilter sits loose, or the group drips during the shot. Replacing it restores a firm lock and a clean seal. Breville’s own part is SP0001635.
Because it seals the group rather than the portafilter body, it is keyed to Breville’s 58mm grouphead, not to a portafilter size standard, so it is cross-referenced by machine and not listed on the 58mm size hub. It is a distinct part from the 54mm shower-head seal Breville makes for its Barista/Bambino line, and does not fit those machines. Verified against Breville’s official part page on 2026-07-13.
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