McDonnell & Miller 312200 Gasket

Maintaining the integrity of boiler water feeders and liquid level controls requires high-performance sealing components designed for steam and hydronic environments. The McDonnell & Miller 312200 Gasket is a critical replacement valve bracket gasket engineered specifically for Series 21, Series 25A, and Series 27 units, including the 27W model. As the direct updated version for 311100, this part ensures a precision fit for mechanical water feeder repair, preventing hazardous leaks at the valve assembly interface. Sold as a Package of 5, these gaskets provide technicians with the necessary inventory for routine maintenance on Series 221 make-up water feeders and liquid level controllers. Heavy-duty construction allows these gaskets to withstand the thermal stresses inherent in commercial boiler systems and condensate receiver tanks. When performing a teardown of the valve housing bracket, always clean the mating surfaces of the Series 21-27 bodies to ensure the 312200 gasket achieves a positive seal against the flange.

• Universal Compatibility: Specifically designed for McDonnell & Miller Series 21, 25A, 27, and 221 water feeders.
• Direct Supercession: Seamlessly replaces the legacy 311100 gasket with updated material specs for improved longevity.
• Contractor Multipack: Includes 5 gaskets per package to support multiple service calls and long-term maintenance cycles.
• High-Pressure Reliability: Optimized for use in boiler liquid level control systems requiring durable, leak-proof sealing.
• Precise Fitment: Engineered to match the four-bolt valve bracket pattern for the Model 21-27 series.

Is the 312200 a direct replacement for the 311100 gasket?
Yes, the McDonnell & Miller 312200 is the official updated part number that replaces the discontinued 311100. It is functionally identical but features improved material properties for modern HVACR applications.

Which water feeder models use this valve bracket gasket?
This gasket is used on several McDonnell & Miller products, most notably the Series 21, Series 25A, Series 27W, and Series 221 make-up feeders.

What are the torque requirements for the valve bracket bolts when using this gasket?
When installing the 312200 gasket on a Model 21-27 bracket, it is standard practice to hand-secure the four bolts and then tighten them to approximately 16 ft/lbs to ensure an even seal across the valve assembly.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.