Float bowl nut seal for the Dellorto PHB and PHBE carburetors.
Fits the 21 mm (spanner width) varieties of that special nut:
The inner diameter is some 20 mm, the outer diameter some 27 mm and it is around 1 mm thick.
This product is priced, and sold, as each.
Required quantity per carburettor: 1
This is item number 56 in the drawing of the Dellorto PHB and Dellorto PHBE carburetors.
This is Dellorto Part Number: 2778