Armstrong Fluid Technology 816304-321 Plastic Impeller
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Armstrong Fluid Technology 816304-321 Plastic Impeller

Armstrong Fluid Technology 816304-321 Plastic Impeller

The Armstrong Fluid Technology 816304-321 Plastic Impeller is a precision-engineered circulator pump replacement designed to maintain peak hydraulic performance in your heating and cooling systems. This 4 3/4 Plastic Impeller NFI is constructed from high-grade, corrosion-resistant Noryl material, ensuring optimal pump efficiency and long-term durability in demanding HVAC environments. As a critical component for fluid flow systems, this lightweight centrifugal pump impeller reduces axial loading on the shaft, which helps extend the operational life of your pump's internal mechanical components. Specifically designed as a direct replacement for Armstrong S-55 and 1050-2B models, the 816304-321 is injection-molded for dimensional perfection and requires no additional balancing during installation. Choosing this OEM pump part ensures seamless integration with your existing Armstrong pump assembly, restoring the necessary flow and pressure required for consistent residential or commercial water circulation.

Key Benefits
  • Precision Performance: The 4-3/4 inch diameter is accuracy-engineered to restore original factory flow rates and system pressure.
  • Corrosion Resistance: Crafted from high-density Noryl plastic to withstand consistent exposure to treated system water without degrading.
  • Reduced Wear: The lightweight design minimizes orbital vibration and axial stress, protecting the motor shaft and bearings.
  • Easy Installation: Features a 1/2-inch shaft size for a standard fit, making it a straightforward swap for 816304-321 and 816304-321K models.
Common Questions

Is this impeller compatible with other pump brands?
While primarily designed for Armstrong S-55 and Series 1050 pumps, this part is frequently used as a compatible replacement for Bell & Gossett PD-35 series pumps using a 4.75" impeller. Always verify the shaft size and diameter before installation.

Does this part require balancing before I install it?
No. Thanks to the advanced injection molding process, this NFI (Non-Ferrous Impeller) is balanced during manufacturing, allowing for immediate installation without the need for manual trimming or adjustment.

Why should I choose the plastic impeller over a bronze or steel version?
The plastic (Noryl) construction provides superior resistance to chemical corrosion and scaling compared to metal alternatives, while also reducing the total weight (approx. 0.4 lbs), which improves start-up efficiency.

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.

This item is not eligible for free shipping.

$488.96
Armstrong Fluid Technology 816304-321 Plastic Impeller
$488.96

Armstrong Fluid Technology 816304-321 Plastic Impeller

The Armstrong Fluid Technology 816304-321 Plastic Impeller is a precision-engineered circulator pump replacement designed to maintain peak hydraulic performance in your heating and cooling systems. This 4 3/4 Plastic Impeller NFI is constructed from high-grade, corrosion-resistant Noryl material, ensuring optimal pump efficiency and long-term durability in demanding HVAC environments. As a critical component for fluid flow systems, this lightweight centrifugal pump impeller reduces axial loading on the shaft, which helps extend the operational life of your pump's internal mechanical components. Specifically designed as a direct replacement for Armstrong S-55 and 1050-2B models, the 816304-321 is injection-molded for dimensional perfection and requires no additional balancing during installation. Choosing this OEM pump part ensures seamless integration with your existing Armstrong pump assembly, restoring the necessary flow and pressure required for consistent residential or commercial water circulation.

Key Benefits
  • Precision Performance: The 4-3/4 inch diameter is accuracy-engineered to restore original factory flow rates and system pressure.
  • Corrosion Resistance: Crafted from high-density Noryl plastic to withstand consistent exposure to treated system water without degrading.
  • Reduced Wear: The lightweight design minimizes orbital vibration and axial stress, protecting the motor shaft and bearings.
  • Easy Installation: Features a 1/2-inch shaft size for a standard fit, making it a straightforward swap for 816304-321 and 816304-321K models.
Common Questions

Is this impeller compatible with other pump brands?
While primarily designed for Armstrong S-55 and Series 1050 pumps, this part is frequently used as a compatible replacement for Bell & Gossett PD-35 series pumps using a 4.75" impeller. Always verify the shaft size and diameter before installation.

Does this part require balancing before I install it?
No. Thanks to the advanced injection molding process, this NFI (Non-Ferrous Impeller) is balanced during manufacturing, allowing for immediate installation without the need for manual trimming or adjustment.

Why should I choose the plastic impeller over a bronze or steel version?
The plastic (Noryl) construction provides superior resistance to chemical corrosion and scaling compared to metal alternatives, while also reducing the total weight (approx. 0.4 lbs), which improves start-up efficiency.

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.

This item is not eligible for free shipping.

Product Information

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Description

The Armstrong Fluid Technology 816304-321 Plastic Impeller is a precision-engineered circulator pump replacement designed to maintain peak hydraulic performance in your heating and cooling systems. This 4 3/4 Plastic Impeller NFI is constructed from high-grade, corrosion-resistant Noryl material, ensuring optimal pump efficiency and long-term durability in demanding HVAC environments. As a critical component for fluid flow systems, this lightweight centrifugal pump impeller reduces axial loading on the shaft, which helps extend the operational life of your pump's internal mechanical components. Specifically designed as a direct replacement for Armstrong S-55 and 1050-2B models, the 816304-321 is injection-molded for dimensional perfection and requires no additional balancing during installation. Choosing this OEM pump part ensures seamless integration with your existing Armstrong pump assembly, restoring the necessary flow and pressure required for consistent residential or commercial water circulation.

Key Benefits
  • Precision Performance: The 4-3/4 inch diameter is accuracy-engineered to restore original factory flow rates and system pressure.
  • Corrosion Resistance: Crafted from high-density Noryl plastic to withstand consistent exposure to treated system water without degrading.
  • Reduced Wear: The lightweight design minimizes orbital vibration and axial stress, protecting the motor shaft and bearings.
  • Easy Installation: Features a 1/2-inch shaft size for a standard fit, making it a straightforward swap for 816304-321 and 816304-321K models.
Common Questions

Is this impeller compatible with other pump brands?
While primarily designed for Armstrong S-55 and Series 1050 pumps, this part is frequently used as a compatible replacement for Bell & Gossett PD-35 series pumps using a 4.75" impeller. Always verify the shaft size and diameter before installation.

Does this part require balancing before I install it?
No. Thanks to the advanced injection molding process, this NFI (Non-Ferrous Impeller) is balanced during manufacturing, allowing for immediate installation without the need for manual trimming or adjustment.

Why should I choose the plastic impeller over a bronze or steel version?
The plastic (Noryl) construction provides superior resistance to chemical corrosion and scaling compared to metal alternatives, while also reducing the total weight (approx. 0.4 lbs), which improves start-up efficiency.

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.

This item is not eligible for free shipping.

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