{"product_id":"mcdonnell-miller-304200-head-gasket-10pk","title":"McDonnell \u0026 Miller 304200 Head Gasket 10PK","description":"\u003cp\u003eMaintain a reliable, pressure-tight seal in your hydronic system with the \u003cstrong\u003eMcDonnell \u0026amp; Miller 304200\u003c\/strong\u003e head gasket, supplied in a convenient 10-pack. This essential component is engineered to provide the high-integrity fit required to prevent leaks and maintain operational safety across various boiler control installations. Whether you are performing routine annual maintenance or addressing a specific seal failure, this \u003cstrong\u003e304200\u003c\/strong\u003e replacement part ensures your equipment continues to function within specified pressure parameters.\u003c\/p\u003e\u003cp\u003eThe head gasket functions by creating a compression seal between the control head and the body of the unit, effectively containing the fluid or steam within the intended flow path. By replacing worn or brittle gaskets with this genuine McDonnell \u0026amp; Miller component, technicians can mitigate the risk of seeping, which protects sensitive internal electronics and mechanical sensors from environmental exposure and moisture damage.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Sealing Integrity:\u003c\/strong\u003e Precision-molded material ensures a secure, airtight bond to prevent fluid bypass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent Material Quality:\u003c\/strong\u003e Constructed from durable, heat-resistant materials capable of withstanding the elevated temperatures of hydronic heating environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintenance Convenience:\u003c\/strong\u003e Packaged as a 10-piece set to streamline inventory management for multi-unit facility maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Designed specifically for McDonnell \u0026amp; Miller boiler controls and low-water cut-off assemblies where a head-to-body gasket is required to restore unit performance.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43128504451166,"sku":"304200","price":178.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/304200_image_b04256ec-acd9-4a8c-a686-ea611b0313c4.png?v=1786066250","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-304200-head-gasket-10pk","provider":"National Boiler Supply","version":"1.0","type":"link"}