OEM Piaggio  Waterpump assembly for Vespa GTS and GTV models, as well as other 250 and 300cc Scooters using the Piaggio Quasar engine.  8798315

This is a new Genuine Vespa Spare Part in Piaggio Packaging. 

You will need the case gasket, part number 840504

https://scooterpartsco.com/recambi-scooter/scooter/gasket-piaggio-cover-water-pump-for-vespa

The preformed O-ring for the cover is 485080

https://scooterpartsco.com/vespa-parts-catalog/vespa-gaskets-and-seals/pre-formed-o-ring-485080

To use this part on engines built prior to March 2006, the stator will have to be replaced with part 58070R, because the older stator is not compatible with this water pump.