La Marzocco Blind Filter Basket for KB90 (Straight-In) – Genuine Spare Part
No coffee grounds, no spout – just a solid, blind basket that seals the portafilter completely. That's exactly what the KB90's daily backflushing routine needs, on a 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 basket is made specifically for this version and can only be used with the matching Straight-In portafilter.
Why such a simple piece of metal matters so much
During backflushing, the machine pushes water back through the brew group instead of forward – a process that only works with a sealed basket. Without an intact blind filter basket, the water would simply flow down through the open portafilter instead of flushing through the brew group and valves.
On a machine like the KB90, which gets backflushed multiple times a day in busy cafés, a blind filter basket 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 basket for backflushing |
| Material |
Stainless steel |
| Origin |
La Marzocco, Florence, Italy |
| Item number |
A03148 |
Who it's for
For everyone running a KB90 daily whose blind filter basket is warped, no longer sits flat, or who simply needs a spare for the daily routine. A simple but essential tool for machine care.
Goes well with
For a full clean of the KB90, our cleaning products are a good fit. 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 are a good fit. More on the KB90 can be found in our La Marzocco Collection.
Frequently asked questions
Does this blind filter basket also fit other La Marzocco machines?
No, this blind filter basket is made specifically for the KB90's Straight-In portafilter. Machines with a classic portafilter need their own blind filter basket.
What is a blind filter basket even used for?
It seals the portafilter completely, enabling backflushing of the brew group – a fixed part of daily and periodic machine cleaning.
How do I know the blind filter basket 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 genuine spare part live.
How quickly will the blind filter basket reach me?
Delivery takes place within 2–4 working days, throughout Switzerland and to Liechtenstein.
The roastery tip
A machine 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 who wants to discover a fruity experience: Wild Peach, lively and always a discovery. Our recommendation from the roastery, one of many.
