McDonnell & Miller 312700 Body Gasket

For contractors servicing steam and hot water boilers, the McDonnell & Miller 312700 Body Gasket (Model 37-26) is a critical OEM component required to maintain the pressure-tight integrity of 47 Series mechanical water feeders. This eight-hole gasket is specifically engineered for use with the Series 47-2 combination water feeder and low water cut-off units, as well as the 247 and 247-2 models. Over time, heat cycles and chemical exposure degrade the original seal, leading to bypass leaks that compromise the precision of the feedwater controller. Replacing the 37-26 gasket during annual maintenance ensures the housing remains secure during high-demand operation, preventing moisture migration toward external electrical switches. Designed for Xylem McDonnell & Miller assemblies, this heavy-duty boiler gasket replacement facilitates a flush fit between the feeder body and the valve mechanism, meeting the original factory specifications for system safety and operational reliability in commercial and residential hydronic applications.

• Precision OEM Fit: Features an 8-hole configuration specifically punched for the McDonnell & Miller 47 series housing to ensure uniform bolt compression.
• System Reliability: Restores a hermetic seal to prevent nuisance tripping of the low water cut-off and maintain accurate boiler water levels.
• Broad Compatibility: Engineered as a direct replacement for 312700 and 313800 part numbers across Series 47, 47-2, 247, and 247-2 feeders.
• Durable Material: Constructed to withstand the high-temperature environment of steam boiler headers without premature hardening or cracking.

• When should I replace the 47 Series body gasket? It is standard trade practice to replace the gasket whenever the feeder body is opened for internal float inspections, strainer cleaning, or valve cartridge replacement to prevent future leaks.
• Is the 37-26 gasket compatible with both 47 and 247 models? Yes, this eight-hole gasket is the correct technical specification for both the 47 and 247 series mechanical water feeders.
• What causes these gaskets to fail? Frequent thermal cycling and the accumulation of sediment near the body seal can cause the material to lose its elasticity, requiring a new OEM replacement part.

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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.