Group Seal Shim

Rubber seal shim, size 73 x 58 x 1mm. Fits a variety of different manufacturers, suitable for 57mm groupheads.

Fine-tune the fit of your group head with our Group Seal Shim—a slim spacer used to adjust and optimize portafilter engagement on espresso machines. When your new seal isn’t the perfect fit, a shim can prevent locking issues and ensure a tight, leak-free seal.

Key Benefits:

• Precision adjustment: Use when the group seal is slightly too thin or thick—shims are a practical solution to fine-tuning without replacing the seal entirely. 

• Extended part life: For machines aged 3–5 years, 1 shim is typically recommended; for 5–10 years, 2 shims may be used—beyond that, consider replacing the group head or portafilter. 

• Simple to use: Insert the shim between the group seal and group head to adjust height—and test portafilter bite. Easy way to perfect extraction without drastic changes.

• Reliable service tool: A subtle yet essential part of espresso machine maintenance—ensures shot consistency, reduces leaks, and saves on unnecessary replacements.

Why It Matters

Even a minor misalignment between the portafilter and group head can affect water pressure, shot quality, and service speed. A Group Seal Shim helps you calibrate precisely—giving a snug, consistent fit that’s essential for top performance.