No, this brush does not fit the Miele Guard S1 hoover. It is only compatible with models from the Classic C1, Compact C1/C2 and Complete C1/C2/C3 series.
The Miele Parquet Twister XL SBB 400-3 is not directly compatible with the Miele Duoflex HX1, as the HX1 series uses a different tube and click system than the classic Miele upright hoovers.
The Miele Parquet Brush Twister XL SBB 400-3 is compatible with hoovers in the Miele Classic C1, Compact C1, Compact C2, Complete C1 and Complete C2 and Complete C3 series, but it is not specifically stated that it is compatible with the Guard M1 Cat & Dog model.
The Guard M1 Cat & Dog model is a separate series with its own accessories, including a specific parquet brush and a pet hair brush, but compatibility with the Parquet Brush Twister XL SBB 400-3 is not confirmed in the information available.
The brush is a worthwhile investment.
Extremely manoeuvrable, light and only a little high so that you can get under furniture easily and efficiently. Only for carpet it is not particularly suitable.
Highly recommended.
The inner diameter of the tube of the Miele floor brush measures 35 mm. I can highly recommend this part as the manoeuvrability is extremely high. So vacuuming under a cupboard or bed is no longer a problem.
The tube is standard, fits all hoovers. Only the brush itself is longer than the regular ones. The vacuuming runs very well, you can vacuum a lot of surface area with the XL version and the work goes faster.