Lochinvar & A.O. Smith 100277953 Volute Gasket

The Lochinvar & A.O. Smith 100277953 Volute Gasket is a critical sealing component engineered for high-performance circulating pumps within commercial and residential hydronic systems. This OEM replacement gasket is physically and technically identical to ARM1010 (previously 100133544), ensuring a precision fit for critical pump-to-volute interfaces. Designed specifically for compatibility with ARM3022PBF pump models, as well as the ARM3024, ARM3072, and ARM3077 series, this gasket maintains the hydraulic integrity necessary to prevent system pressure loss and fluid leaks. For veterans in the field, this pump volute seal is a standard requirement during routine boiler pump maintenance or when performing a full Lochinvar pump repair. Utilizing genuine hydronic heating gaskets ensures that the volute housing remains airtight under thermal expansion and high-flow conditions, protecting the motor and surrounding components from moisture damage. Whether you are servicing a Knight boiler or a commercial A.O. Smith water heating plant, this 100277953 volute gasket provides the high-tolerance seating required for professional-grade service.

• Precision OEM Alignment: Engineered specifically for the Lochinvar ARM3022PBF and ARM3024/72/77 series pumps to ensure zero-leak performance.
• Direct Cross-Reference: Fully interchangeable with ARM1010 and obsolete part number 100133544 for seamless inventory management.
• Thermal Stability: Constructed from high-grade materials to withstand the temperature fluctuations common in intensive hydronic heating applications.
• Hydraulic Efficiency: Maintains the critical seal between the pump head and the volute, preventing cavitation and maintaining flow rate consistency.

Which pump models use the 100277953 volute gasket?
This gasket is primarily designed for the ARM3022PBF pump, but also fits the ARM3024PABTE, ARM3072PABTE, and corresponding PBF versions utilized in various Lochinvar and A.O. Smith heating systems.

Is the 100277953 different from the ARM1010?
No. In the Lochinvar and A.O. Smith parts ecosystem, 100277953 is the current manufacture part number for the gasket previously identified as ARM1010 or 100133544. They are the same physical component.

Should I replace the volute gasket every time the pump is pulled?
Yes. To ensure a pressure-tight seal and prevent nuisance leaks upon reassembly, most field technicians replace the volute gasket whenever the pump head is separated from the volute housing.

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.