{"product_id":"armstrong-816302-319k-impeller-universal-5-inch-h-51","title":"Armstrong 816302-319k Impeller Universal 5 Inch H-51","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ARMSTRONG 816302-319k is a universal replacement impeller designed for use in Armstrong hydronic circulator and pump assemblies. The impeller measures 5 inches in diameter and is referenced under the H-51 classification, indicating its fit within a specific Armstrong pump family. This component is responsible for moving fluid through the hydronic loop, converting rotational energy from the pump motor into flow and pressure. Installation is performed by licensed HVAC technicians and plumbers servicing hydronic heating and cooling systems. The universal designation indicates cross-compatibility across multiple Armstrong pump configurations sharing the H-51 dimensional profile.\u003c\/p\u003e\n\u003cp\u003eThis impeller is suited for residential and light commercial hydronic systems where Armstrong circulators are installed. Typical applications include hot water heating loops, chilled water systems, and radiant floor systems that rely on Armstrong pump assemblies. The 5-inch diameter and H-51 designation narrow the fitment to specific pump housings within the Armstrong lineup. Technicians replacing worn, cavitated, or damaged impellers will find this part an OEM-style fit for the applicable pump configurations. The 1B and 1.25B references in the part designation may indicate bore sizing relevant to shaft compatibility.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e5-inch impeller diameter matches H-51 Armstrong pump classification\u003c\/li\u003e\n  \u003cli\u003eUniversal replacement design compatible across multiple Armstrong pump configurations\u003c\/li\u003e\n  \u003cli\u003eOEM-referenced part for Armstrong hydronic circulator and pump assemblies\u003c\/li\u003e\n  \u003cli\u003eBore references (1B and 1.25B) address shaft fitment for applicable pump models\u003c\/li\u003e\n  \u003cli\u003eDesigned for fluid-moving duty in hydronic heating and cooling loops\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement impeller for Armstrong hydronic pump assemblies within the H-51 classification. Refer to the Armstrong parts reference for full model-level compatibility before installation.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eImpeller replacement on hydronic circulators should be performed by a licensed HVAC technician or plumber. Isolate and drain the affected pump section before disassembly, and ensure system pressure is fully relieved prior to opening the pump housing. Verify shaft diameter and bore compatibility against the 1B or 1.25B designation before installation. Follow applicable mechanical codes and the pump manufacturer service documentation throughout the procedure.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eImpeller Diameter\u003c\/strong\u003e: 5 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePump Classification\u003c\/strong\u003e: H-51\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: Universal Replacement Impeller\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: ARMSTRONG\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 816302-319k\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ARMSTRONG AIR","offers":[{"title":"Default Title","offer_id":51162120094002,"sku":"816302-319K","price":392.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/306260049.jpg?v=1778890979","url":"https:\/\/voomisupply.com\/products\/armstrong-816302-319k-impeller-universal-5-inch-h-51","provider":"Voomi Supply","version":"1.0","type":"link"}