{"product_id":"mcdonnell-miller-134900-51-hd-head-mechanism-for-mechanical-water-feeder","title":"McDonnell \u0026 Miller 134900 51-HD Head Mechanism for Mechanical Water Feeder","description":"\u003cp\u003eMaintaining consistent boiler water levels is essential for safe operation, and the \u003cstrong\u003e134900\u003c\/strong\u003e head mechanism provides a reliable solution for your \u003cstrong\u003e51-HD\u003c\/strong\u003e mechanical water feeder. This factory-authorized replacement ensures your system continues to regulate water levels accurately, preventing dry-fire conditions and extending the life of your hydronic or steam equipment.\u003c\/p\u003e\u003cp\u003eThis head mechanism functions as the core control component of the water feeder, utilizing a precision-engineered float linkage system to detect fluid levels and trigger necessary makeup water flow. By replacing the entire head, you ensure all internal seals and mechanical linkages are returned to factory specifications, eliminating potential leaks or valve sticking associated with aged control assemblies.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Regulation:\u003c\/strong\u003e Maintains consistent water levels to prevent low-water boiler cut-offs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Engineered with industrial-grade materials for long-term operation under high-pressure conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeamless Compatibility:\u003c\/strong\u003e Designed for an exact fit with 51-HD series mechanical water feeders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimplified Installation:\u003c\/strong\u003e Streamlines maintenance by allowing for quick replacement of worn internal control components.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Recommended for use in commercial steam boilers and industrial hydronic heating systems requiring robust mechanical make-up water control.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43125817049182,"sku":"134900","price":1263.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/134900_image_c0b31c18-29bc-42ba-a8bc-6d5ecd31378f.png?v=1786038458","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-134900-51-hd-head-mechanism-for-mechanical-water-feeder","provider":"National Boiler Supply","version":"1.0","type":"link"}