The existing rubber on the side of the bin doesn't perfectly close the duct so sometimes it would make the dust skip the bin when you are doing some heavy motions which makes the bin shake.
This piece of rubber on the side of the vacuum cleaner around the intake duct ensures the connection is airtight.
I use it with PHILIPS XC8147/01 SpeedPro Max Aqua but it should be compatible with most SpeedPro models as far as I'm aware.
A bit of superglue will hold it well in place.
Note: the design is elliptic to match the hole so make sure to rotate it into correct direction.
The author marked this model as their own original creation.