La Marzocco Blind Filter for KB90 (Straight-In) – Original Spare Part
No coffee grounds, no spout – just a solid, blind filter that seals the portafilter completely. That's exactly what the KB90's daily backflush routine needs, the machine built for high speed and long operating days.
The KB90 works with a straight portafilter insert, the so-called Straight-In system, designed to reduce wrist movement and speed up the workflow behind the counter. The blind filter is made for exactly this version and only works with the matching Straight-In portafilter.
Why a simple piece of metal matters so much
During backflushing, the machine presses water back through the group head instead of forward – a process that only works with a sealed filter. Without an intact blind filter, the water would simply flow down through the open portafilter instead of flushing through the group head and valves.
On a machine like the KB90, which in busy cafés is often backflushed several times a day, a blind filter that sits flat and isn't warped is part of the daily maintenance routine – not an extra, but a basic essential.
At a Glance
| Compatible with |
La Marzocco KB90 (Straight-In portafilter) |
| Function |
Blind filter for backflushing |
| Material |
Stainless steel |
| Origin |
La Marzocco, Florence, Italy |
| Part number |
A03148 |
Who it's for
For anyone running a KB90 in daily service whose blind filter is warped, no longer sits flat, or who simply needs a spare for their daily routine. A simple but indispensable tool for machine care.
A good match
For a full clean of the 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. You'll find more around the KB90 in our La Marzocco collection.
Frequently Asked Questions
Does this blind filter also fit other La Marzocco machines?
No, this blind filter is made specifically for the KB90's Straight-In portafilter. Machines with a classic portafilter need their own blind filter.
What's a blind filter even needed for?
It seals the portafilter completely, enabling the group head to be backflushed – a fixed part of daily and periodic machine cleaning.
How can I tell the blind filter needs replacing?
If it no longer sits flat in the portafilter or shows visible deformation, it's worth replacing.
Can I see the product before buying?
Yes, in our showrooms in Bern (Gerberngasse 44) and Zürich (Hagenholzstrasse 50b) you can experience the original spare part live.
How quickly will the blind filter reach me?
Delivery takes place within 2–4 working days, across Switzerland and to Liechtenstein.
The Roastery Tip
A machine that's in daily use deserves beans that consistently deliver. Our main recommendation: Cozy Chocolate and Nutty Delight, dense, aromatic, full-bodied. For maximum body with no acidity at all: Very Nutty. For anyone wanting to discover a fruity experience: Wild Peach, vivid and always a discovery. Our recommendation from the roastery, one of many.
