
Lochinvar & A.O. Smith 100074381 Filter Plug
The Lochinvar & A.O. Smith 100074381 Filter Plug is a critical OEM component designed for high-efficiency water heating and HVAC applications. Engineered for precision fitment, this replacement filter plug (MPN: 100074381) serves as a specialized sealing and filtration interface within the intake or inlet assembly of compatible units, including select tankless water heater parts and commercial boilers. As a genuine OEM part, it ensures the integrity of the system's pressurized environment while preventing particulate bypass that can lead to heat exchanger fouling or sensor malfunction.
For contractors, maintaining system compatibility is paramount. This 0.05 lb plug is specifically utilized in A.O. Smith, Lochinvar, and Takagi units to maintain factory-spec airflow and fluid dynamics. Unlike generic alternatives, this water heater filter plug features specialized threading and material composition to withstand the thermal cycling common in intensive HVACR environments. Reliable filtration at the entry point is essential for preventing the pilot failures and combustion inefficiencies often caused by debris accumulation in the burner assembly or intake manifold.
Key Benefits:- OEM Precision: Guaranteed genuine A.O. Smith part fitment for specific tankless and boiler models, ensuring no-leak performance.
- Debris Protection: Acts as a primary barrier against particulates, protecting sensitive internal components from premature wear.
- Contractor-Grade Durability: Constructed from high-spec polymers designed for long-term exposure to varying HVACR temperatures.
- Standardized Replacement: Direct 100074381 replacement for simplified maintenance during routine service calls.
- Is this part universal for all A.O. Smith tankless units? No, this is a model-specific component. Always verify your specific unit's serial and model number before installation.
- Can this plug be cleaned or must it be replaced? While some surface debris can be cleared, if the integrated filter media or threading shows signs of degradation, it should be replaced to maintain system safety.
- What tools are needed for installation? Most technicians can install this by hand or with a standard wrench; avoid over-torquing to prevent damage to the housing or threads.
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.
Original: $6.44
-65%$6.44
$2.25Lochinvar & A.O. Smith 100074381 Filter Plug
The Lochinvar & A.O. Smith 100074381 Filter Plug is a critical OEM component designed for high-efficiency water heating and HVAC applications. Engineered for precision fitment, this replacement filter plug (MPN: 100074381) serves as a specialized sealing and filtration interface within the intake or inlet assembly of compatible units, including select tankless water heater parts and commercial boilers. As a genuine OEM part, it ensures the integrity of the system's pressurized environment while preventing particulate bypass that can lead to heat exchanger fouling or sensor malfunction.
For contractors, maintaining system compatibility is paramount. This 0.05 lb plug is specifically utilized in A.O. Smith, Lochinvar, and Takagi units to maintain factory-spec airflow and fluid dynamics. Unlike generic alternatives, this water heater filter plug features specialized threading and material composition to withstand the thermal cycling common in intensive HVACR environments. Reliable filtration at the entry point is essential for preventing the pilot failures and combustion inefficiencies often caused by debris accumulation in the burner assembly or intake manifold.
Key Benefits:- OEM Precision: Guaranteed genuine A.O. Smith part fitment for specific tankless and boiler models, ensuring no-leak performance.
- Debris Protection: Acts as a primary barrier against particulates, protecting sensitive internal components from premature wear.
- Contractor-Grade Durability: Constructed from high-spec polymers designed for long-term exposure to varying HVACR temperatures.
- Standardized Replacement: Direct 100074381 replacement for simplified maintenance during routine service calls.
- Is this part universal for all A.O. Smith tankless units? No, this is a model-specific component. Always verify your specific unit's serial and model number before installation.
- Can this plug be cleaned or must it be replaced? While some surface debris can be cleared, if the integrated filter media or threading shows signs of degradation, it should be replaced to maintain system safety.
- What tools are needed for installation? Most technicians can install this by hand or with a standard wrench; avoid over-torquing to prevent damage to the housing or threads.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Lochinvar & A.O. Smith 100074381 Filter Plug is a critical OEM component designed for high-efficiency water heating and HVAC applications. Engineered for precision fitment, this replacement filter plug (MPN: 100074381) serves as a specialized sealing and filtration interface within the intake or inlet assembly of compatible units, including select tankless water heater parts and commercial boilers. As a genuine OEM part, it ensures the integrity of the system's pressurized environment while preventing particulate bypass that can lead to heat exchanger fouling or sensor malfunction.
For contractors, maintaining system compatibility is paramount. This 0.05 lb plug is specifically utilized in A.O. Smith, Lochinvar, and Takagi units to maintain factory-spec airflow and fluid dynamics. Unlike generic alternatives, this water heater filter plug features specialized threading and material composition to withstand the thermal cycling common in intensive HVACR environments. Reliable filtration at the entry point is essential for preventing the pilot failures and combustion inefficiencies often caused by debris accumulation in the burner assembly or intake manifold.
Key Benefits:- OEM Precision: Guaranteed genuine A.O. Smith part fitment for specific tankless and boiler models, ensuring no-leak performance.
- Debris Protection: Acts as a primary barrier against particulates, protecting sensitive internal components from premature wear.
- Contractor-Grade Durability: Constructed from high-spec polymers designed for long-term exposure to varying HVACR temperatures.
- Standardized Replacement: Direct 100074381 replacement for simplified maintenance during routine service calls.
- Is this part universal for all A.O. Smith tankless units? No, this is a model-specific component. Always verify your specific unit's serial and model number before installation.
- Can this plug be cleaned or must it be replaced? While some surface debris can be cleared, if the integrated filter media or threading shows signs of degradation, it should be replaced to maintain system safety.
- What tools are needed for installation? Most technicians can install this by hand or with a standard wrench; avoid over-torquing to prevent damage to the housing or threads.
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.












