Quick answer
If you see water leaking around the portafilter, notice cracks or flattening on the gasket, or the portafilter no longer locks in smoothly, replace the group head gasket. For the Espresso Series 1, use the Espresso Series 1 Group Head Gasket for a proper seal.
Why the group head gasket wears out
The group head gasket sits between the portafilter and the group head, sealing the brew path under pressure. Over time, heat, coffee oils, and repeated locking and unlocking cause the rubber to harden, flatten, or crack. These changes reduce its ability to seal, leading to leaks and inconsistent extraction.
Regular cleaning and careful portafilter insertion can extend gasket life, but eventually replacement is necessary. Knowing the signs helps you act before a small leak becomes a bigger problem.
When to stop and seek help
If you replace the gasket and still experience leaks, or if you notice damage to the group head itself, stop and contact Fellow support. A new gasket cannot fix a worn group head or a misaligned portafilter. Also, if you are unsure about the condition of other seals, it's best to have a professional inspect the machine.
Diagnose your gasket issue
- Symptom: Water leaks around the portafilter during extraction: Likely cause: A worn or hardened gasket that no longer seals properly. Corrective action: Replace the gasket with the Espresso Series 1 Group Head Gasket. If the leak persists after replacement, check for group head damage or portafilter wear.
- Symptom: Visible cracks, tears, or flattening on the gasket: Likely cause: Age and heat exposure have degraded the rubber. Corrective action: Replace the gasket immediately to prevent extraction issues. Inspect the gasket regularly during cleaning to catch wear early.
- Symptom: Portafilter doesn't lock in smoothly or feels loose: Likely cause: The gasket has compressed and lost its elasticity. Corrective action: Replace the gasket to restore a snug fit. If the portafilter still feels loose with a new gasket, the issue may be with the portafilter or group head.
- Symptom: Inconsistent shot pressure or channeling: Likely cause: A failing gasket can cause pressure drops during extraction. Corrective action: Replace the gasket and check for other causes like grind size or puck prep. Address the gasket first; if problems continue, review your espresso technique.
Product facts
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Espresso Series 1 Group Head Gasket: This replacement group head gasket is designed specifically for use with the Espresso Series 1. Using the correct gasket ensures a proper seal and reliable performance, avoiding leaks caused by ill-fitting parts.
Espresso Series 1 Group Head Gasket