carburetor diaphragm 20mm round slide diameter for China 4-stroke 139QMB/QMA

Carburettor diaphragm for original carburettors fitted to the Chinese imported 4 stroke scooters with the 139QMA/QMB.
This said, there are still numerous variations and we offer all, please see part numbers BT16644, BT14345, BT16007. The main difference is the diameter of the neck that enters the carb.
This version has ta 20mm diameter.