McDonnell & Miller 342300 Strainer Assembly and Gasket

The McDonnell & Miller 342300 Strainer Assembly and Gasket (Model SA51-9R) is a high-performance filtration component engineered specifically for 25A Series make-up water feeders, as well as the 21 and 221 Series. In commercial steam and hydronic systems, maintaining water quality is critical to preventing valve seat fouling. This assembly features a robust strainer basket capable of removing particulates as small as 100 microns, protecting the integral water feeder from debris that compromises flow control. Designed to handle operating pressures up to 125 PSI and temperatures reaching 250°F, this replacement strainer assembly ensures long-term system integrity. The kit includes the specialized strainer gasket and Tetraseal O-ring required for a leak-proof seal during boiler maintenance or head assembly repair. For veteran contractors, this OEM part provides the precise tolerance needed to maintain tight closure on make-up water feeder valves, preventing overfilling and ensuring consistent boiler water levels.

Key Benefits

• Broad Compatibility: Direct fit for McDonnell & Miller Series 21, 25-A, and 221 feeders.
• Industrial-Grade Filtration: Captures sediment and scale to prevent valve seat damage and clogging.
• Complete Assembly: Includes the SA51-9R strainer basket, gasket, and required seals for immediate field installation.
• High Thermal Rating: Operates reliably in high-temperature fluid systems up to 250°F.

Common Questions

• How often should the strainer be serviced? For optimal HVAC system performance, pull and clean the screen at least twice per heating season.
• Does this include the O-ring? Yes, this assembly includes the 37-101 Tetraseal O-ring and the 21-27 gasket.
• What is the micron rating? The screen is designed to filter out particles larger than 100 microns.

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.