Very good brush for special cases

The brush can be stuck directly onto the tube to the handle and on the tube.

I use the SUB 20 for sucking of walls and ceilings, or for sucking in inaccessible corners.

Suction of walls and ceilings
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Here I put the SUB 20 on tube and place the brush on a straight. This combination has a long reach and can be pretty easily free the blanket of cobwebs.

Sucking in inaccessible corners
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Because the brush is very slim and can be adjusted flexibly by joints reach even the most inaccessible corners.

Vulnerabilities
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The joints latch is not strong and if you exert a little pressure, the brush moved by itself.

The brush is harder than the SUB 10th

Demarcation to SUB 10
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The SUB 20 can be adjusted flexibly, however, this setting does not retain pressurized. The Miele Universal brush SUB 10 has softer bristles and is stable.
The SUB 10 is better suited for dusting or vacuuming furniture.
The SUB 20 is very well suited for the extraction of walls or ceilings.