Bollfilter 2708947 Bearing

The 2708947 bearing is a rolling bearing used inside certain Bollfilter assemblies, especially automatic and back‑flushing filter units.
In spare‑parts lists for Bollfilter models such as the 6.60 series, 2708947 is listed as a:

Taper Rolling Bearing

Deep Groove Ball Bearing
depending on the translation in the parts list. 

This means it is a precision mechanical bearing that supports rotating parts inside the filter mechanism.