Neat rubber intake for Derbi Variants with the Flat Reed, Start III, or Start V engine.
The rubber intake itself has a 31mm ID so will accept Mikuni TM24 or some of the larger spigot mount AMAL carburetors.
The adapter has a 23mm OD so with some shimming you could probably get a Dellorto PHBG on there but it is kind of an odd size. Strange. 19mm ID on the adapter so that's your limit if you use it.
The outlet on the reed side is 30mm x 22mm. The intake is ~24mm ID all the way through.