La Marzocco Gasket for KB90 Blind Filter Basket – Original Spare Part
A blind filter basket alone doesn't seal completely on its own – it's the thin rubber ring around its edge that keeps water from escaping sideways during backflushing. Small, unassuming, but without it the whole routine doesn't work as intended.
On the KB90, this gasket is exposed daily, often several times a day, to the same cycle of pressure, heat and cleaning agent. It's exactly this combination that makes rubber grow brittle and less elastic over time.
A ring that quietly does its job
Rubber seals gradually lose tension through repeated heat and mechanical stress. Once the gasket no longer sits exactly on the blind filter basket, pressure can escape sideways during backflushing instead of working fully through the group head – cleaning becomes less thorough without you noticing right away.
Replacing this small ring is one of the simplest and most affordable maintenance jobs on the KB90, with a direct effect on your daily backflushing routine.
At a glance
| Compatible with |
La Marzocco blind filter basket for KB90 (Straight-In) |
| Function |
Gasket for the blind filter basket |
| Material |
Rubber, heat-resistant |
| Origin |
La Marzocco, Florence, Italy |
| Item number |
A03149 |
Who it's for
For anyone with a KB90 whose blind filter basket no longer seals completely during backflushing, even though the basket itself is still in good condition. A small, affordable replacement instead of a whole new blind filter basket.
Goes well with
For the complete cleaning of your KB90, our cleaning products are a good match. For the grinder next to it, take a look at our coffee grinders – from the Varia VS3 to the Weber Workshops EG-1. For dosing, our coffee scales from Normcore to Acaia fit right in. More on the KB90 is available in our La Marzocco collection.
Frequently asked questions
Do I need to replace the whole blind filter basket if only the rubber is brittle?
No, that's exactly why this gasket is available separately as a spare part.
How can I tell the rubber needs replacing?
If water escapes sideways at the blind filter basket during backflushing, or the ring looks visibly cracked, it's worth replacing it.
Can I replace it myself?
Yes, the gasket is easy to swap on the blind filter basket, no special tools needed.
Can I see the product before buying it?
Yes, in our showrooms in Bern (Gerberngasse 44) and Zurich (Hagenholzstrasse 50b) you can experience the original spare part live.
How quickly will I get the spare part?
Delivery takes 2–4 working days, throughout Switzerland and to Liechtenstein.
The roastery tip
Small maintenance jobs make a difference – just like the choice of bean. Our main recommendation: Cozy Chocolate and Nutty Delight, dense, aromatic, full-bodied. For maximum body with no acidity at all: Very Nutty. For anyone who wants to discover a fruity experience: Wild Peach, lively and always a discovery. Our recommendation from the roastery, one of many.
