{"product_id":"haywardbypassvalvekithaxbpk1931hpphaxbpk1931","title":"Hayward Bypass Valve Kit | HAXBPK1931","description":"\u003cdiv class=\"product-description\"\u003e\n\n  \u003ch2\u003eHayward HAXBPK1931 Bypass Kit (Old Style Header) — H-Series \/ ED1 (Pre-10\/28\/2000)\u003c\/h2\u003e\n\n  \u003cp\u003e\n    The Hayward \u003cstrong\u003eHAXBPK1931\u003c\/strong\u003e is an OEM \u003cstrong\u003eheater bypass kit\u003c\/strong\u003e designed for Hayward\n    \u003cstrong\u003eH-Series\u003c\/strong\u003e gas pool heaters that use the \u003cstrong\u003eold style header\u003c\/strong\u003e. The bypass assembly helps regulate internal\n    water flow through the heater’s heat exchanger, supporting stable operation and helping protect the exchanger under varying flow conditions.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eFits \/ Compatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eHayward \u003cstrong\u003eH-Series Millivolt \u0026amp; Electronic Ignition (ED1 style)\u003c\/strong\u003e heaters made \u003cstrong\u003ebefore 10\/28\/2000\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCommon compatible ED1 models include: \u003cstrong\u003eH1501\u003c\/strong\u003e, \u003cstrong\u003eH2001\u003c\/strong\u003e, \u003cstrong\u003eH2501\u003c\/strong\u003e (verify heater data plate)\u003c\/li\u003e\n    \u003cli\u003eAlso commonly referenced for select \u003cstrong\u003eH-Series Induced Draft\u003c\/strong\u003e heater applications that use the old style header\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003e\n    \u003cstrong\u003eFit tip:\u003c\/strong\u003e Hayward has different bypass kits depending on heater generation\/header style. Confirm your heater manufacture\n    date and header style before ordering (this kit is for the \u003cstrong\u003eolder\u003c\/strong\u003e style configuration).\n  \u003c\/p\u003e\n\n  \u003ch3\u003eWhat’s Included\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eBlack plastic \u003cstrong\u003ebypass baffle\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRound bypass end\u003c\/strong\u003e (brass)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBypass shaft and plug\u003c\/strong\u003e (brass)\u003c\/li\u003e\n    \u003cli\u003e\u003cstrong\u003eBypass spring\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHeader O-ring\u003c\/strong\u003e (commonly referenced as \u003cstrong\u003eHAXHOR1930\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eCommon Reasons to Replace\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eHeater header service where the bypass parts are worn, damaged, or missing\u003c\/li\u003e\n    \u003cli\u003eRecurring header leaks traced to a flattened or damaged header O-ring\u003c\/li\u003e\n    \u003cli\u003eFlow-related heater issues where inspection shows a stuck or deteriorated bypass assembly\u003c\/li\u003e\n    \u003cli\u003ePreventive rebuild on older H-Series heaters to restore proper internal flow control\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eSpecs (Quick Reference)\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003ePart Number: \u003cstrong\u003eHAXBPK1931\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePart Type: \u003cstrong\u003eHeater Bypass Kit (Old Style Header)\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePool Type: \u003cstrong\u003eIn-Ground\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003eApprox. Shipping Weight: \u003cstrong\u003e14.4 lb\u003c\/strong\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eTurn off power to the heater and pump, and allow the heater to cool before servicing.\u003c\/li\u003e\n    \u003cli\u003eRelieve system pressure before opening the header\/union area.\u003c\/li\u003e\n    \u003cli\u003eClean header sealing surfaces and O-ring grooves before installing new components.\u003c\/li\u003e\n    \u003cli\u003eUse a light coat of \u003cstrong\u003esilicone-based\u003c\/strong\u003e lubricant on O-rings only (never petroleum-based).\u003c\/li\u003e\n    \u003cli\u003eIf the header is cracked\/warped or sealing surfaces are damaged, replacing the bypass kit alone may not stop leaks.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eRelated Products\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=HAXBPK1931\"\u003eHayward HAXBPK1931 Bypass Kit (search)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=HAXHOR1930\"\u003eHayward HAXHOR1930 Header O-Ring (search)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=HAXNNO1930\"\u003eHayward HAXNNO1930 Heater Union\/Nipple Kit (search)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=HAXPSA1930\"\u003eHayward HAXPSA1930 Water Pressure Switch Assembly (search)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=hayward%20h-series%20heater%20parts\"\u003eHayward H-Series Heater Parts (search)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=silicone%20pool%20lube\"\u003eSilicone O-Ring \u0026amp; Gasket Lubricant (search)\u003c\/a\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr\u003e\n\n  \u003ch3\u003eMaintenance Tips\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eKeep filter pressure under control—dirty filters and restricted flow can cause heater issues that look like bypass problems.\u003c\/li\u003e\n    \u003cli\u003eMaintain balanced water chemistry to reduce scale in the heat exchanger and header area.\u003c\/li\u003e\n    \u003cli\u003eAfter any header service, run the system and check carefully for slow drips; small leaks can quickly leave mineral deposits and worsen sealing.\u003c\/li\u003e\n    \u003cli\u003eSupport nearby plumbing so the heater header\/unions aren’t under constant stress from misaligned pipes.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n\u003c\/div\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":52589938868540,"sku":"HAXBPK1931","price":69.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/3280\/9276\/files\/hayward-bypass-valve-kit-haxbpk1931-heater-parts-2961845.jpg?v=1772790146","url":"https:\/\/aquapoolsupply.com\/products\/haywardbypassvalvekithaxbpk1931hpphaxbpk1931","provider":"Aqua Pool Supply","version":"1.0","type":"link"}