Thermal Accuracy: Factory-calibrated 55-155°F range prevents heat exchanger fatigue and potential safety hazards

Damper External Drive Pin for Actuator Mounting

Is this gasket compatible with all Weil McLain Ultra models

136 diameter matches your specific heating application requirements during service or installation

Fast Installation: Convenient single-hole mounting simplifies the replacement process for field contractors

McDonnell & Miller 312100 Replacement Gasket Thermal Accuracy: Factory-calibrated 55-155°F rangeThe McDonnell & Miller 312100 Replacement Gasket (Model 27T 13) is a critical sealing component engineered specifically for the 25A Series make up water feeders. For veteran service contractors, maintaining the integrity of the float chamber is paramount for system uptime. This OEM gasket installs between the arm assembly housing and the float housing head, ensuring a precision fit that eliminates bypass leaks and prevents erratic feeder behavior in