This is a BREMBO manifold for front brake lines which sits under the lower triple clamp. The brake line goes from the master cylinder to this, another brake line(s) for to the caliper(s) and sometimes there is a brake light switch in 1 of the holes as well. This is the exact item as found on most Bevel Drive Ducati twins.
This has been blasted and refinished with a chemical resistant finish commonly used in the firearms industry so it will last. It is in perfect restored conditon.