Olympia Teflon Group Head to Boiler Seal + 4 Bolts M6 16mm Included - Fits Most Olympia MachinesCremina Boiler to Grouphead Teflon GasketThis Teflon gasket is designed to seal the connection between the boiler and the group head on all Olympia Cremina machinesregardless of the year. If your Cremina uses an O ring, we strongly recommend replacing it with this Teflon gasket to help prevent the group from overheating. Compatible with Cremina and Cremina SL models Not compatible with Olympia Club models Also fits Maximatic and Coffex machines, but