McDonnell & Miller 313200 Strainer Gasket

For veterans in the field, maintaining a leak-proof seal on critical boiler water feeders is non-negotiable. The McDonnell & Miller 313200 Strainer Gasket (Model 37-39) is a precision-cut 4-hole sealing component designed specifically for McDonnell & Miller 47 Series, 53 Series, 67 Series, and 70 Series water feeders and low water cut-offs. This OEM replacement part is essential when servicing the 14-B blow-down valve or the integrated strainer housing to prevent system weeping and pressure loss.

Constructed from high-grade, heat-resistant materials, this gasket is engineered to withstand the thermal cycling and high-pressure environments common in hydronic heating systems. A failing 37-39 gasket often leads to localized corrosion and scale buildup, which can compromise the accuracy of low water cut-off units. During your yearly teardown, swapping this gasket ensures the integrity of the blow-off assembly, maintaining the tight tolerances required for the McDonnell & Miller 767 and associated feeder models. It is a direct fit for the 313300 alias, providing a reliable mechanical seal that prevents air ingress and fluid loss in commercial and residential boiler applications.

• Compatible with Series 47, 47-2, 53, 67, and 70 water feeders and LWCO units.
• Precisely engineered 4-hole pattern ensures alignment with the 14-B blow-down valve housing.
• Durable material composition resists hardening and degradation from thermal stress.
• Critical for maintaining 100% leak-proof connectivity in hydronic systems.
• Standard McDonnell & Miller 313200 specifications for rapid field replacement.

When should the 37-39 strainer gasket be replaced?
Inspect the gasket during every annual boiler service. If you notice signs of weeping, flattening, or brittleness when the blow-down valve is opened, immediate replacement is required to prevent downstream component damage.

Does this gasket work with the 767 Series?
Yes, the McDonnell & Miller 313200 is the correct replacement part for the blow-off valve used on the Series 767 low water cut-offs, as it shares the same hardware platform as the 67 Series.

Can I reuse the old gasket if it looks intact?
Technical best practice dictates never reusing a compression gasket once the seal is broken. Re-torquing an old 313200 gasket often results in an uneven seal and high failure rates under pressure.

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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.