McDonnell & Miller 342200 Strainer Assembly and Gasket

The McDonnell & Miller 342200 (Model SA51-9) is an OEM strainer assembly and gasket designed for integration with specific boiler water level controls and feeders. This critical maintenance component is engineered for use with 51 Series mechanical water feeders, including the 51S and 51S-2 combination units. It is also the correct replacement assembly for 25A liquid level controls and 851S series make-up water feeders. By effectively filtering debris and sediment from the water line, this assembly protects the internal valve seat and float mechanism from fouling, ensuring the continued reliability of the boiler’s low water cut-off and feeding functions.

This strainer basket assembly features a durable bronze housing and a high-mesh stainless steel screen capable of withstanding the thermal and pressure demands of hydronic and steam systems. The kit includes the replacement gasket required to maintain a pressure-tight seal upon reinstallation. For contractors performing annual service or troubleshooting feed rate inconsistencies, replacing a clogged or corroded SA51-9 is a standard procedure to restore optimal flow and prevent premature wear on the feeder’s internal components.

• Ensures peak performance for McDonnell & Miller 51S, 25A, and 851S controls by preventing particulate buildup.
• Includes the essential sealing gasket to prevent leaks and ensure a secure mechanical fit during service.
• Constructed with a heavy-duty stainless steel strainer basket for superior corrosion resistance in high-temperature environments.
• OEM 342200 specification guarantees precise thread alignment and internal clearances within the feeder body.
• Simplifies maintenance cycles by providing a complete strainer assembly for rapid field replacement.

Is the SA51-9 compatible with all 51 series feeders?
It is specifically designed for the 51S and 51S-2 variants, as well as the 851S and 25A. Always verify your specific model suffix before installation.

Does this assembly include the gasket?
Yes, the McDonnell & Miller 342200 includes both the strainer basket and the necessary gasket for the housing.

Why is my water feeder surging or slow to refill?
A common culprit for restricted feed rates is a clogged strainer assembly. Debris accumulation in the mesh will impede water flow, requiring a thorough cleaning or a complete replacement of the SA51-9.

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.