{"title":"Armstrong Pumps \u0026 Circulators","description":"\u003cp\u003eDiscover a comprehensive selection of \u003cstrong\u003eArmstrong Fluid Technology pumps, circulators, and OEM replacement parts\u003c\/strong\u003e. Known globally for energy-efficient fluid flow and heat transfer solutions, Armstrong delivers industry-leading reliability for both residential hydronics and heavy-duty commercial HVAC systems. Browse our inventory of wet-rotor circulators, 3-piece in-line pumps, and repair kits below.\u003c\/p\u003e\n\n\u003ch3\u003eHigh-Efficiency Armstrong Pumps for Every Application\u003c\/h3\u003e\n\u003cp\u003eArmstrong Fluid Technology is a leading global manufacturer of heating, ventilation, air-conditioning, and cooling equipment. Whether you are outfitting a commercial building or upgrading a residential hot water system, Armstrong provides energy-saving pump solutions engineered for maximum efficiency and minimal lifecycle costs.\u003c\/p\u003e\n\n\u003ch3\u003ePopular Armstrong Product Lines\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAstro 2 \u0026amp; E.2 Series Circulators:\u003c\/strong\u003e Zero-maintenance wet-rotor circulators designed for quiet, efficient operation in residential hydronic heating, radiant floor systems, and geothermal loops.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eS\u0026amp;H Series 3-Piece Circulators:\u003c\/strong\u003e Durable fixed-speed in-line pumps built with a modular, back pull-out design for simplified shaft and bearing assembly maintenance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDesign Envelope \u0026amp; Commercial Pumps:\u003c\/strong\u003e High-performance vertical in-line, end suction, and split-case pumps equipped with intelligent variable-speed controls to cut energy costs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGenuine Armstrong Replacement Parts:\u003c\/strong\u003e Authentic seal kits, bearing assemblies, flange hardware, and pump-less-volute repair kits to keep your system running smoothly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eNeed help sizing or cross-referencing an Armstrong pump?\u003c\/strong\u003e Contact our technical support team to verify flow rates, head pressure, and model compatibility before you buy.\u003c\/p\u003e","products":[{"product_id":"armstrong-4300-vertical-pumps","title":"Armstrong Series 4300 Vertical In-Line Commercial Pump","description":"\u003cdiv style=\"font-family: Arial, sans-serif; font-size: 15px; color: #333333; line-height: 1.6;\"\u003e\n  \u003cp\u003e\n    The \u003cstrong\u003eArmstrong Series 4300 Vertical In-Line Commercial Pump\u003c\/strong\u003e is a high-performance system component engineered to deliver premium fluid distribution efficiency and reliability. Built with a heavy-duty pipe-mounted casting, this unit provides exceptional durability and outstanding resistance to demanding system environments. Its low-maintenance, high-performance architecture makes it an ideal solution for large-scale commercial HVAC-system pumping, hydronic cooling loops, and industrial fluid processing lines.\n  \u003c\/p\u003e\n  \u003cp style=\"margin-top: 15px;\"\u003e\n    By pioneering a smart vertical inline configuration, the Series 4300 mounts directly into standard industrial pipework to completely eliminate the need for heavy inertia bases, foundation housekeeping pads, flexible connectors, or field grouting routines. The layout features an advanced split-coupling system, enabling mechanical seal replacement directly through the structural gap between the pump and motor shafts without ever disrupting your mechanical lines or motor alignment setup. Driven by high-efficiency premium motors optimized for inverter-fed or variable frequency drive (VFD) applications, this pump dramatically trims hydraulic friction losses while minimizing spatial requirements.\n  \u003c\/p\u003e\n\n  \u003c!-- Advanced Engineering Features Bullets --\u003e\n  \u003cdiv style=\"margin-top: 25px; margin-bottom: 20px;\"\u003e\n    \u003ch4 style=\"font-size: 16px; font-weight: bold; margin-bottom: 10px; color: #111111; border-bottom: 2px solid #111111; padding-bottom: 5px;\"\u003eAdvanced Engineering Features:\u003c\/h4\u003e\n    \u003cul style=\"margin: 0; padding-left: 20px; font-size: 14px; color: #333333; line-height: 1.6;\"\u003e\n      \u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong\u003eAxially Split Spacer Coupling:\u003c\/strong\u003e High-tensile rigid aluminum alloy bracket structure allows swift mechanical seal extractions without removing heavy motor components or disrupting the core line casing.\u003c\/li\u003e\n      \u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong\u003eDynamically Balanced Impeller Core:\u003c\/strong\u003e Eliminates static shaft deflection and limits motor shaft run-out to deliver ultra-quiet, vibration-free fluid velocity distribution.\u003c\/li\u003e\n      \u003cli style=\"margin-bottom: 8px;\"\u003e\n\u003cstrong\u003eBearingless Fluid Housing Design:\u003c\/strong\u003e Eliminates traditional internal pump-side bearings to maximize system uptime and eliminate routine grease or lubrication tasks.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Armstrong","offers":[{"title":"Default Title","offer_id":42913145225310,"sku":"ARM-4300-15","price":8281.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/Armstrong_Series_4300_split-coupled_commercial_vertical_in-line_centrifugal_fluid_pump_featuring_a_heavy_cast_body_and_top-mounted_industrial_electric_motor_drive..png?v=1782005129"},{"product_id":"armstrong-1-ld-free-floating-lever-drain-trap-1-8-orifice-121-psig","title":"Armstrong 1-LD Free Floating Lever Drain Trap 1\/8\" Orifice 121 psig","description":"\u003cp\u003eDesigned to safely remove condensate and excess water from boiler and hydronic systems, this free‑floating lever drain trap ensures reliable pressure relief and maintenance of system efficiency. The \u003cstrong\u003e1-LD\u003c\/strong\u003e model from Armstrong features a 1\/8\" orifice capable of handling up to 121 psig, making it ideal for high‑pressure applications.\u003c\/p\u003e\u003cp\u003eThe lever‑activated float rises with water level, opening the orifice to vent pressure once the preset threshold is reached. When the water drains below the set point, the float drops, closing the valve to prevent backflow and maintain system integrity.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Rating:\u003c\/strong\u003e Handles up to 121 psig, suitable for most commercial boiler loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrifice Size:\u003c\/strong\u003e 1\/8\" inlet ensures precise flow control and minimizes water hammer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFloat Design:\u003c\/strong\u003e Free‑floating lever provides quick response to changing water levels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Flexibility:\u003c\/strong\u003e Compatible with standard 1\/8\" pipe threads for easy retrofit.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Boiler condensate lines, hydronic heating loops, fire‑tube boiler systems, and high‑pressure steam condensate return.\u003c\/p\u003e","brand":"Armstrong","offers":[{"title":"Default Title","offer_id":43112708669534,"sku":"1-LD","price":268.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/1_LD_image_d6df011c-047a-478e-af7b-6746f680eb66.png?v=1785947191"},{"product_id":"armstrong-1-ld-free-floating-lever-drain-trap-38-orifice-182-psig","title":"Armstrong 1-LD Free Floating Lever Drain Trap #38 Orifice 182 psig","description":"\u003cp\u003eA free‑floating lever drain trap efficiently removes condensate and excess water from heating and cooling systems, protecting equipment from corrosion. The \u003cstrong\u003e1-LD\u003c\/strong\u003e model from Armstrong is engineered with a #38 orifice and a 182 psig rating to ensure reliable operation.\u003c\/p\u003e\u003cp\u003eThe trap uses a lever‑activated, free‑floating mechanism that opens the orifice for rapid discharge when pressure builds, then automatically reseats to prevent leaks. Its design eliminates the need for external power and reduces maintenance intervals.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrifice Size:\u003c\/strong\u003e #38 opening provides optimal flow for typical condensate rates.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Pressure:\u003c\/strong\u003e Rated for up to 182 psig, suitable for high‑pressure steam and hot‑water loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLever Action:\u003c\/strong\u003e Free‑floating lever delivers quick, manual discharge and self‑sealing when released.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard 1‑inch waste lines for easy integration.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Commercial boiler condensate lines, hydronic heating loops, chilled water system condensate drains, and industrial HVAC condensate removal.\u003c\/p\u003e","brand":"Armstrong","offers":[{"title":"Default Title","offer_id":43112708767838,"sku":"1-LD","price":268.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/1_LD_image_58cd2e34-b1ac-4cc3-9af6-0cf629551567.png?v=1785947240"},{"product_id":"armstrong-1-ld-free-floating-lever-drain-trap-5-64-orifice-300-psig","title":"Armstrong 1-LD Free Floating Lever Drain Trap 5\/64\" Orifice 300 psig","description":"\u003cp\u003eDesigned to safely remove condensate and excess water from hydronic and HVAC loops, this free‑floating lever drain trap provides dependable operation under high pressure. The \u003cstrong\u003e1-LD\u003c\/strong\u003e model fits seamlessly into standard pipework, offering a 5\/64″ orifice and a 300 psig rating.\u003c\/p\u003e\u003cp\u003eThe trap features a cast‑iron body with a floating lever that automatically seals when water is absent, preventing air ingress. When the lever is lifted, condensate flows freely through the precisely sized orifice, allowing quick draining without tools.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Working Pressure:\u003c\/strong\u003e Handles up to 300 psig, ensuring durability in high‑pressure applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrifice Size:\u003c\/strong\u003e 5\/64″ aperture delivers accurate flow control for condensate removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLever Action:\u003c\/strong\u003e Free‑floating lever enables rapid, tool‑free draining and automatic reseating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Cast‑iron body resists corrosion and mechanical wear.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for boiler condensate lines, chilled‑water system drains, fire‑sprinkler condensate loops, and any high‑pressure HVAC or hydronic circuit requiring reliable condensate removal.\u003c\/p\u003e","brand":"Armstrong","offers":[{"title":"Default Title","offer_id":43112708997214,"sku":"1-LD","price":398.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/1_LD_image_48c9dfdd-bef4-4c97-bea6-ad94543992e9.png?v=1785947310"},{"product_id":"armstrong-1-ld-free-floating-lever-drain-trap-7-64-orifice-143-psig","title":"Armstrong 1-LD Free Floating Lever Drain Trap 7\/64\" Orifice 143 psig","description":"\u003cp\u003eDesigned to safely discharge condensate and maintain system pressure, this free‑floating lever drain trap ensures reliable removal of water from boilers and hydronic loops. The **1-LD** model from Armstrong provides a 7\/64\" orifice and handles up to 143 psig, making it ideal for demanding HVAC applications.\u003c\/p\u003e\u003cp\u003eThe trap features a lever‑actuated, free‑floating mechanism that opens only when pressure exceeds the set point, allowing water to exit while preventing back‑flow and maintaining system integrity.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrifice Size:\u003c\/strong\u003e 7\/64\" for precise flow control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Rating:\u003c\/strong\u003e Certified to 143 psig.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLever Design:\u003c\/strong\u003e Free‑floating action eliminates back‑pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Construction:\u003c\/strong\u003e Durable brass body for long‑term reliability.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️\u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for boiler condensate drains, steam system moisture removal, and hydronic heating loop protection.\u003c\/p\u003e","brand":"Armstrong","offers":[{"title":"Default Title","offer_id":43112714993758,"sku":"1-LD","price":268.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/1_LD_image_e65d5a1e-6a4c-4fcb-9f97-ffe442c0e341.png?v=1785947354"},{"product_id":"armstrong-104301-011-flange-cast-iron-1-1-2-npt","title":"Armstrong 104301-011 Flange Cast Iron 1-1\/2\" NPT","description":"\u003cp\u003eThis heavy‑duty cast‑iron flange provides a secure, leak‑free seal for 1‑1\/2\" NPT pipe connections in commercial and industrial heating systems. It is fully compatible with Armstrong equipment and replaces the original \u003cstrong\u003e104301-011\u003c\/strong\u003e part.\u003c\/p\u003e\u003cp\u003eThe flange’s precision‑milled faceplate mates directly with the pipe’s thread, creating a metal‑to‑metal interface that distributes pressure evenly, while the integrated gasket seat ensures a tight seal even under high‑temperature cycles.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Durability:\u003c\/strong\u003e Cast iron construction resists corrosion and thermal stress.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection Size:\u003c\/strong\u003e 1‑1\/2\" NPT thread matches standard pipe dimensions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Rating:\u003c\/strong\u003e Engineered for up to 150 psi in closed‑loop systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e Operates reliably from -20°F to 250°F.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Suitable for boiler return lines, hot‑water heating loops, chilled water systems, and retrofits of aging pipework.\u003c\/p\u003e","brand":"Armstrong","offers":[{"title":"Default Title","offer_id":43118365212766,"sku":"104301-011","price":79.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/104301_011_image_2b79884a-2d10-4630-82d2-1bbcc41a6627.jpg?v=1785971807"},{"product_id":"armstrong-104442-000-gasket-body","title":"Armstrong 104442-000 Gasket Body","description":"\u003cp\u003eDesigned to provide a reliable, watertight seal in Armstrong boiler and hydronic heating systems, this gasket body helps prevent leaks and maintain pressure integrity. The \u003cstrong\u003e104442-000\u003c\/strong\u003e gasket body fits specified Armstrong models and is crafted from high‑temperature resistant material for long service life.\u003c\/p\u003e\u003cp\u003eThe gasket body incorporates a precision‑molded sealing lip that compresses against mating surfaces when bolted, creating an airtight barrier that resists thermal expansion and water pressure fluctuations. Its robust construction ensures consistent performance throughout the boiler’s operating cycle.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Integrity:\u003c\/strong\u003e Maintains a leak‑free joint under high temperature and pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Resistance:\u003c\/strong\u003e Operates reliably up to 250 °F (121 °C).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Rating:\u003c\/strong\u003e Rated for up to 150 psi system pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Compatibility:\u003c\/strong\u003e Compatible with standard Armstrong boiler flanges and copper, steel, or brass connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Installation:\u003c\/strong\u003e Fits without additional machining, reducing downtime.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e🚫 \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Suitable for Armstrong gas‑fired boilers, steam condensers, and other high‑temp hydronic loops where a gasket body is required.\u003c\/p\u003e","brand":"Armstrong","offers":[{"title":"Default Title","offer_id":43118400471134,"sku":"104442-000","price":21.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/104442_000_image_3b3949a2-e5ac-4570-b0ed-1a89401779ef.png?v=1785973367"},{"product_id":"armstrong-1050-2b-cast-iron-circulating-pump-3-4-hp-1-phase","title":"Armstrong 1050-2B Cast Iron Circulating Pump 3\/4 HP 1-Phase","description":"\u003cp\u003eDesigned to deliver reliable water circulation for residential and light‑commercial heating systems, this cast‑iron pump ensures consistent flow and pressure. The **1050-2B** model provides a robust 3\/4 HP, 1‑phase motor that can be customized to match specific flow curves.\u003c\/p\u003e\u003cp\u003eThe pump operates on a sealed‑bearing, end‑suction design, moving water through a cast‑iron volute that minimizes turbulence while maintaining high efficiency. Its durable construction and adjustable flow settings make it ideal for systems that demand higher pressure and volume.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlow Capacity:\u003c\/strong\u003e engineered for higher flow rates to meet demanding applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Output:\u003c\/strong\u003e maintains sufficient head to support multi‑zone heating loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnergy Efficiency:\u003c\/strong\u003e 3\/4 HP motor delivers reliable performance with reduced electricity use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e cast‑iron body resists corrosion and wear in continuous service.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomizable Curve:\u003c\/strong\u003e flow curve can be tuned to exact system requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e suitable for single‑family homes, multi‑unit residences, small commercial boiler plants, and any system requiring higher flow and pressure.\u003c\/p\u003e","brand":"Armstrong","offers":[{"title":"Default Title","offer_id":43118539964510,"sku":"1050-2B","price":3408.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/1050_2B_image_a7cb79bc-00b1-4c50-993b-c67d8c104f58.png?v=1785975914"},{"product_id":"armstrong-105210-011-cast-iron-pump-flange-2","title":"Armstrong 105210-011 Cast Iron Pump Flange 2\"","description":"\u003cp\u003eThe pump flange provides a sturdy, leak‑resistant connection between a pump and the surrounding piping in hydronic heating systems. 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