Overview of Primary Product

121-138 Series
In-Line Circulators
121-138 In-Line Cartridge
Design Pump Series:
Applications
Designed to efficiently circulate
heated or chilled water in large
residential and commercial Hydronic
Systems. Ideal for primary-secondary
systems, as well as parallel pumping
designs. Available in bronze con-
struction for fresh water service.
Features
Proven Performance: In-Line Cartridge
Design Pumps are backed by years of
Taco experience in design and manu-
facture of circulators. Hundreds 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 condi-
tioning systems requiring high head
performance, pressure boosting, and
recirculation systems with relatively
low volume.
Unique Cartridge Design:
Replaceable “cooler running” bearing
cartridge extends bearing life. With
permanently sealed grease lubricated
ball bearings it is virtually mainte-
nance free.
Built to Last
Cartridge Bearing Assembly
Cartridge design isolates the bear-
ings from the effects of system fluid
temperatures which greatly extends
bearing life
• Alloy steel shaft
• Cupro-Nickel shaft sleeve
Mechanical Seal
• Two piece carbon/ceramic seal
is standard
• Sealide-C/viton available for high
temperature and aggressive
water applications
Body & 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 built to Hydraulic
Institute standards and 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