La Marzocco KB90 Shower Screen

Genuine La Marzocco replacement shower screen for the KB90, part number A.5.095, designed to keep every shot dispersing evenly across the puck.

The shower screen sits at the top of the KB90's Straight-In coffee group, and it plays a bigger role in shot quality than its size suggests. Its job is to spread water evenly across the coffee bed as it enters the group, so the puck saturates uniformly rather than being hit hardest in one spot. Over time, mineral scale and coffee oils build up on the screen's surface, and a worn or clogged screen leads to uneven saturation, which shows up in the cup as inconsistent extraction no matter how dialled in your grind and dose are.

This is the genuine La Marzocco part, etched with the La Marzocco logo, made specifically for the KB90's group head assembly. Fitting it correctly restores full, even water distribution and helps get the group back to giving you the extraction consistency you'd expect from a KB90. It's a straightforward maintenance swap that most technicians and confident baristas can carry out during routine group servicing, alongside a group gasket change.

As with any wear part on a high volume commercial machine, replacing the shower screen on a regular schedule is the more reliable approach rather than waiting for extraction problems to appear. Busy multi-group sites in particular will get more consistent shots across all groups by keeping screens on a routine replacement cycle rather than reacting once quality starts to drift.

• Genuine La Marzocco part
• Part number: A.5.095
• Description: Coffee shower screen with La Marzocco logo, H3.8
• Designed specifically for the La Marzocco KB90 Straight-In coffee group assembly
• Etched with the La Marzocco logo
• Fits within the group cap assembly, positioned beneath the diffuser screw
• Wear part, recommended for periodic replacement as part of routine group maintenance

What machine is this shower screen for?
This is the genuine shower screen for the La Marzocco KB90, designed specifically for its Straight-In coffee group assembly.

What does a shower screen actually do?
It sits at the top of the group and spreads incoming water evenly across the coffee puck, so the whole bed saturates at the same rate during extraction.

How do I know if my shower screen needs replacing?
Signs include visible scale or oil buildup, uneven extraction despite consistent puck prep, or a screen that looks discoloured or pitted compared to when it was new.

How often should the shower screen be replaced?
This depends on water hardness, usage volume and cleaning routine, but most commercial sites replace it as part of scheduled group servicing rather than waiting for a visible fault.

Is this a genuine La Marzocco part?
Yes. This is the genuine part, A.5.095, etched with the La Marzocco logo, as listed in La Marzocco's official KB90 parts documentation.

Can I fit this myself or does it need a technician?
It's part of a standard group service and can be fitted by a confident barista or in-house technician, though many sites prefer to have it done alongside other maintenance by a qualified engineer.

Does the shower screen affect crema or flavour?
Indirectly, yes. A worn screen causes uneven water distribution, which leads to inconsistent extraction and can show up as sourness, bitterness or a flat crema depending on how the puck is being under or over-extracted in different areas.

Is this compatible with other La Marzocco machines?
This specific part is listed by La Marzocco for the KB90's Straight-In group assembly. If you're fitting it to a different model, check compatibility with your machine's parts documentation first, as group designs vary across the range.