Taco, 110-251F, Pump Flange, Threaded, Cast Iron

The Taco 110-251F Cast Iron Freedom Flange provides a secure, durable, and easy-to-install connection for hydronic and heating circulator pumps.

Engineered for reliability and performance, the Taco 110-251F Pump Flange is part of the Freedom Flange® series, designed to simplify installation and maintenance of Taco circulator pumps. Constructed from heavy-duty cast iron, this threaded flange provides a strong, leak-free connection to 3/4-inch NPT piping. Its rugged build and precise dimensions ensure dependable performance in hydronic heating, cooling, and plumbing systems.

• Model number 110-251F identifies the Taco Freedom Flange Pump Flange with 3/4-inch NPT pipe connections.
• Designed for Taco circulator pumps and compatible hydronic system components.
• Provides quick installation and removal without disconnecting the entire piping system.

Technical Data & Performance

• Product Type: Pump Flange.
• Brand: Taco.
• Series: Freedom Flange® – designed for easy maintenance and secure fitment.
• Material: Cast Iron – durable, corrosion-resistant construction for long service life in closed-loop systems.
• Connection Type: Threaded.
• Pipe Size: 3/4 inch NPT female threaded connection.
• Dimensions:
  • Height: 2-3/4 inches.
  • Width: 4-1/8 inches.
  • Thickness: 3/8 inch.
• Flange Opening: Sized for Taco circulator pump bolt pattern.
• Bolt Holes: Precision-machined for easy alignment and secure mounting.
• Pressure Rating: 125 psi (862 kPa) maximum working pressure (typical for hydronic systems).
• Temperature Range: Up to 240°F (115°C) suitable for hot water and heating applications.
• Surface Finish: Machined cast iron with rust-inhibiting coating for protection and dimensional accuracy.
• Application: Designed for residential, commercial, and light industrial hydronic systems.
• Function: Provides pump-to-pipe connection while allowing easy access for service or replacement.
• Installation: Threaded female NPT connection allows secure attachment to standard piping; includes bolt holes for pump connection.
• Compatibility: Works with Taco 00 series and similar hydronic circulator pumps.
• Maintenance: Low-maintenance design; inspect periodically for thread integrity and corrosion in open systems.
• Corrosion Resistance: Cast iron body designed for closed hydronic systems to minimize oxygen-induced rusting.
• Weight: Compact and lightweight for easy handling during installation.
• Compliance: Meets ASTM A48 standards for cast iron materials and ANSI B1.20.1 for pipe threads.
• Packaging: Sold as a pair of flanges with bolts and gaskets (depending on model configuration).
• Warranty: Covered by Taco’s Limited Manufacturer’s Warranty ensuring material and performance reliability.