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, gasket is now recommended for the heating element application.
The La Marzocco o-ring 04150 made with FKM (Viton®) rubber is also available.
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.