PK86 is likely a clamp-on pod air filter with a urethane flange/mouth (i.e., fits over/onto a carburetor/intake pipe)
It may be foam material, often black (or dual-layer), like other Uni Pod filters
It is possibly designed/sized for Ducati intake pipe dimensions or Ducati models
It could be a dual-layer version (outer coarse + inner fine foam) to improve dust filtering
As a pod filter, it would replace stock airbox elements or be used in modified setups where you mount an open filter directly to intakes
Requires proper oiling of the foam after cleaning to trap dust particles effectively
