Does the Mares proton XL 2nd stage regulator have a plastic insert between the purge button and the diaphragm?

Yes, the Mares Proton XL second stage regulator features a plastic insert between the purge button and the diaphragm. This design helps to ensure smooth operation of the purge button while also protecting the diaphragm from potential damage. The insert contributes to the overall performance and reliability of the regulator in various diving conditions.