1-1/4" Cast Iron Flange

The Taco 110-253F Circulator Flange provides a durable, leak-free connection for hydronic heating and cooling pumps with 1-1/4 inch NPT threaded pipe fittings.

The Taco 110-253F Cast Iron Circulator Pump Flange is engineered for use with Taco hydronic circulator pumps, ensuring a strong and reliable threaded connection to heating system piping. Constructed from heavy-duty cast iron, it offers long service life and superior corrosion resistance in closed-loop hydronic applications. Designed for quick installation and easy maintenance, this flange is ideal for residential and commercial hydronic heating, cooling, and domestic hot water recirculation systems.

• Model number 110-253F identifies the Taco Cast Iron Circulator Flange with 1-1/4-inch NPT (female threaded) pipe connections.
• Designed for use with Taco 00 Series circulator pumps and compatible hydronic system configurations.
• Provides a secure, threaded connection between the pump and the system piping.

Technical Data & Performance

• Product Type: Circulator Pump Flange.
• Brand: Taco.
• Material: Cast Iron – rugged, durable, and corrosion-resistant for long-lasting use in closed hydronic systems.
• Pipe Connection Size: 1-1/4 inch NPT (Female Threaded).
• Connection Type: Threaded – standard National Pipe Thread for compatibility with most hydronic piping systems.
• Compatibility: Specifically designed for Taco 00 Series circulator pumps and equivalent models requiring 1-1/4" flanges.
• Dimensions (Approximate):
  • Height: ~2-3/4 inches.
  • Width: ~4-1/8 inches.
  • Thickness: ~3/8 inch.
• Pressure Rating: 125 psi (862 kPa) maximum working pressure.
• Temperature Rating: Up to 240°F (115°C) operating temperature.
• Mounting Type: Flanged, bolt-on connection for easy attachment to circulator pumps.
• Surface Finish: Machined cast iron with protective black enamel coating to resist corrosion and oxidation.
• Function: Provides a reliable, sealed connection between pump and threaded piping.
• Installation: Quick, secure mounting using supplied or standard hardware and gaskets.
• Corrosion Resistance: Optimized for closed-loop hydronic systems where oxygen exposure is minimized.
• Application: Suitable for hydronic heating, cooling, geothermal, and domestic hot water recirculation systems.
• Compliance: Meets ASTM A48 Class 30B standards for cast iron quality and ANSI B1.20.1 for NPT threaded connections.
• Maintenance: Low-maintenance design; inspect periodically for gasket and thread integrity.
• Compatibility Notes: Fits Taco Freedom Flange® kits and other Taco flange accessories.
• Weight: Compact, durable design for ease of handling and installation.
• Packaging: Supplied as a pair of flanges (typical) with mounting bolts and gaskets depending on configuration.
• Warranty: Backed by Taco’s Limited Manufacturer’s Warranty ensuring quality and performance.

Applications & Benefits

• Provides a strong, secure connection between hydronic circulator pumps and system piping.
• Cast iron construction ensures durability, strength, and thermal stability under high-pressure operation.
• Simplifies installation and removal of pumps during system service or replacement.
• Compatible with residential and commercial hydronic systems including boilers, chillers, and radiant heating setups.
• Delivers long-term corrosion resistance in closed-loop systems for reliable performance.