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Silicone O-ring - 04150. 3.53 mm thick, with an internal diameter of 37.69 mm. Also functions as a seal for the drain cup assembly and boiler cap flange in the Baby T model.
A new, more robust, is now recommended for the heating element application.
The La Marzocco 04150 made with FKM (Viton®) rubber is also available.
