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121-138 Series In-Line Circulators

 Proven Performance — In-Line Cartridge Design Pumps are backed by over 42 years of Taco experience in design and manufacture of circulators. Tens of thousands are in service. Dependable — Quiet Operation — In-Line Cartridge. Design Pumps offer quiet, dependable pumping power and long-lasting performance. Ideal for heating and/or air conditioning systems requiring high head performance with relatively low volume. Unique Cartridge Design — The Taco “Cartridge” pumps are the first in-line pumps to be specifically designed for hot water service. The unique cartridge design allow operation in systems up tol 300°F. Bearing lubricant is isolated from the effects of the system fluid temperature. The Taco Cartridge pumps are the only in-line pumps having a centrifugal lubrication system. A dip stick is provided to check the oil level and a drain plug is provided to change the oil when necessary.




  • Cartridge Bearing Assembly
  • Centrifugal lubrication system — filled at the factory
  • Extra heavy journal bearings and thrust bearings — separately lubricated
  • Lip type oil seals to prevent leakage
  • Alloy steel shaft
  • Cupro-Nickel shaft sleeve
  • Mechanical Seal
  • Two-piece carbon/ni-resist seal is standard
  • Carbon/ceramic standard on bronze models
  • Carbon/tungsten carbide available for high temperature applications 
  • Body and Flanges available in cast iron or bronze 
  • In-Line configuration
  • Companion flanges provided in 2 1/2" or 3". 
  • Impeller dynamically and hydraulically balanced
  • Enclosed type — cast iron or bronze
  • Drive Coupling
  • Rugged, flexible rubber construction
  • Absorbs angular and parallel misalignment.
  • Rugged Motor available in single and three phase, and all standard voltages
  • Open-drip proof enclosure
  • Equipped with sleeve bearings for quiet operation
  • Resilient mounted
  • Built-in overload protector on single phase models. Factory Tested
  • Every pump is operated before shipment.
  • Easy, Low-Cost Service
  • No special tools required
  • One Cartridge bearing assembly fits all models — replace cartridge only, not bracket
  • One mechanical seal fits all models.

Typical Applications

  • Designed to efficiently circulate heated or chilled water in large residential and commercial hydronic or solar systems
  • Ideal for primary-secondary systems,as well as parallel pumping designs
  • Available in bronze construction for fresh water service.