Armstrong Fluid Technology 426401-004 Gasket

The Armstrong Fluid Technology 426401-004 Gasket is a critical replacement component designed for high-performance sealing in commercial pumping systems. This 10" Nitrile Gasket (8426401-004) features a precision-engineered 1/16" thickness, providing a robust barrier against fluid leaks in demanding HVAC and industrial environments. Specifically crafted as a pump casing gasket, it is compatible with a wide range of popular models, including the Armstrong 4030, 4280, 4300, and 4380 series. Utilizing high-grade nitrile (NBR) binder or Garlock Blue-Gard 3000 composition, this industrial HVAC seal ensures superior resilience and airtight performance. With dimensions typically measuring 10-5/16" OD and 10-3/16" ID, it is the ideal choice for maintenance professionals performing a pump rebuild on units with up to 10-5/32" maximum impeller diameters. Ensure your system maintains optimal pressure and efficiency with this genuine-spec Armstrong pump part.

Key Benefits

• Leak Prevention: High-density nitrile gasket material eliminates fluid bypass and maintains system pressure.
• Broad Compatibility: Engineered specifically for Armstrong 4030, 4280, 4300, and 4380 pump series.
• Precision Fit: 1/16" thickness ensures a perfect seal for 10-inch nominal casing sizes.
• Chemical Resistance: Nitrile construction offers excellent resistance to oils and common hydronic fluids.

Common Questions

What are the exact dimensions of the 426401-004 gasket?
This gasket typically features a 10-5/16" Outside Diameter (OD), a 10-3/16" Inside Diameter (ID), and is 1/16" thick to fit standard 10-inch pump casings.

Which pump models is this part compatible with?
It is primarily used for Armstrong series 4030, 4280, 4300, and 4380 commercial pumps with various configurations (M and S models).

Is this the same as part number 8426401-004?
Yes, 8426401-004 is the updated or alternate part number for the original 426401-004 Armstrong gasket.

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.

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