Dispersion screw

The single screw that holds the shower screen (and sometimes the dispersion block) onto the underside of the group head.

Why it matters — Dispersion screws are easy to over-torque and strip — especially on softer brass groups. A stripped screw can prevent removal of the screen for cleaning.

Good to know

• Hand-tight is enough. The pressure of the brew won't push the screen off if it's properly seated.
• Keep a few spare dispersion screws on hand — they're inexpensive, and a stripped one can sideline the machine if you don't have a replacement.

Related: Dispersion Screws