Armstrong 174031MF-043, Model S-25, Bronze In-Line Pump Without Flanges, Series S, 1/12 HP, 115 Volts, 1 Phase, 31 GPM Max, Lead Free, Maintenance Free Design

SKU #: 174031MF-043
Brand: Armstrong
In Stock! (Ships Today !) This item is In Stock at our warehouse distribution center. Stock orders placed Monday through Friday by 1:00 pm EST. will be shipped the same day. Orders placed Friday after 1:00 pm through Sunday will be shipped on Monday.
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Armstrong Series S Maintenance Free Circulator Pump

This Armstrong In-Line circulator is suitable for domestic hot water systems. It is built using a standard three-piece design that features a radially-split body, oversized shaft, centrifugal impeller, positive mechanical seal and modular construction. This circulator has been used by HVAC professionals for decades because it is cost-effective, durable and easy to maintain.


  • Maintenance free design which has permanently lubricated ball bearings and requires no maintenance at all
  • Radially-split body can be left in-line while servicing pump, eliminating disconnecting of pipes
  • Oversized shaft made from stainless steel
  • Balanced centrifugal impeller ensures maximum water delivery in the HVAC system
  • Proven seal design made from strong and long-lasting materials for extended operating life
  • Three piece modular construction and back pull-out design for easy replacement of wear components
  • Certified ≤ 0.25 weighted average percent lead and complies with California Health and Safety Code Section 116875 (commonly known as ab1953)

Note: Flanges are sold separately. Options include 116013-841, 116012-841, 116011-841, 116009-841.


Mfg. Number174031MF-043
Product TypeIn-line circulator
ApplicationDomestic water systems
Horsepower1/12 HP
Voltage115 Volts
Frequency60 Hz
Speed1800 RPM
DesignThree piece
Motor TypeODP
FlangesSold separately
Maximum Flow31 GPM
Maximum Head6 ft
Pump BodyLead free bronze
Volute MaterialLead free bronze
Impeller MaterialNon-ferrous
Thermal Overload ProtectionYes
Maximum Fluid Temperature107°F
Maximum Operating Conditions125 psi at 225°F

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*Note: Picture is illustrative and may not reflect the actual product.*