Casa Performance 'PowerFlow' sponge type airfilter for large carbs such as Dell'Orto PHBL or PHBH range (or similar).
The kit consists of the filter and a Maxi airhose Item X62 (Dell'Orto PHBH range, diameter 55mm) or X62a (Dell'Orto PHBL range, diameter 38mm). This can be mounted vertically or horizontally, making it the perfect choice if you have a long range tank fitted. Please note that this is NOT just a simple, foam filter : this has an internal mesh structure and a plastic lower section that will not crush when you attach the airhose to it.

This is a quality product that has been tested to the extreme by Casa Performance.