{"product_id":"astralpool-hurlcon-brass-plug-for-hi-limit-switches","title":"Astralpool Gas Heater Brass Plug - Hi Limit Locator - M4 16mm - ICI, Viron, HiNRG, HX, JX, MX","description":"\u003ch3\u003eAstralpool Gas Heater Brass Plug - Hi Limit Locator - M4 16mm - ICI, Viron, HiNRG, HX, JX, MX\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eAstralpool \/ Hurlcon Gas Heater Threaded Brass Plug – 3\/8\" M4 with Hex Head. Used in HX, JX, MX, Viron, ICI, HiNRG gas heaters. High-limit switches screw into the top of these brass plugs in the heater manifold. \u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003cstrong\u003ePhysically Stocked, unlike most \"drop-shipping\" websites.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003cstrong\u003eShipped from VIC, NSW, WA, QLD\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis genuine brass plug is used in Astralpool and Hurlcon gas heaters to accommodate high-limit (hi-limit) switches. The hi-limit sensor screws directly into this plug. \u003c\/p\u003e\n\u003cp\u003eIt is important to replace or repair these when leaking, and should be checked every 6-12 months. This can be one of the biggest causes of damage to gas heaters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSuits:\u003c\/strong\u003e MX, HX, Viron, JX,\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/astralpool-ici-gas-heater-pool-spa-heater\" title=\"Astralpool ICI Gas Heater\"\u003eICI\u003c\/a\u003e Heaters. \u003cspan\u003eAlso suits Jacuzzi \u003c\/span\u003e\u003cspan\u003eJ-HN250C \u0026amp; J-HN400C heaters. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon Issues:\u003c\/strong\u003e\u003cbr\u003eThese plugs can corrode over time due to poor water quality or if a small leak allows the 24V current from the hi-limit switch to create electrolytic corrosion. If the plug corrodes or leaks, it can lead to premature failure of the hi-limit switch.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDesign Notes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"\"\u003eThread size: 3\/8\" M4\u003c\/li\u003e\n\u003cli class=\"\"\u003eHex head for easy installation\/removal\u003c\/li\u003e\n\u003cli class=\"\"\u003eOlder versions had a 3\/4\" head and measured 13–16mm long\u003c\/li\u003e\n\u003cli class=\"\"\u003eNewer versions have a larger hex head and are 19–25mm long\u003c\/li\u003e\n\u003cli class=\"\"\u003eFully interchangeable – just use extra thread tape and avoid overtightening\u003c\/li\u003e\n\u003cli class=\"\"\u003eNewer style is more robust and longer-lasting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e See product photo for comparison between older and newer styles.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eInstalling:\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003eUse \u003ca href=\"https:\/\/melbournespaparts.com.au\/products\/pink-teflon-ptfe-thread-tape-thick-12mm-for-pool-water\"\u003ePink Thread Tape\u003c\/a\u003e or a chemical-resistant thread sealant for Sealing threads. Care must be taken not to cause radial cracks in the header manifold around the female threaded area. \u0026lt;-- This is usually caused by over-tightening.\u003c\/p\u003e\n\u003cp\u003eThe red fibrous gaskets are no longer used. Use Teflon tape on the thread.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e71053 old \/ 71060 new\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"text-decoration: underline;\"\u003eOther High Limit (Hi Limit) Switches:\u003c\/span\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/high-limit-switch-42-45\" title=\"Inlet Hi Limit Switch Sensor for Hurlcon Raypak Gas Heaters\"\u003e\u003cstrong\u003e42-45C°\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eInlet Hi Limit (Hurlcon, Astralpool, Raypak, Pentair)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/high-limit-switch-52-55\" title=\"Outlet Hi Limit Sensor Switch Hurlcon Astralpool Raypak\"\u003e\u003cstrong\u003e52-55C°\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eOutlet Hi Limit (Hurlcon, Astralpool, Raypak, Pentair)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/high-limit-switch-60-c-raypak-140f-pentair-141f\" title=\"Raypak Pentair HiLimit AGS Sensor Switch\"\u003e\u003cstrong\u003e60C°\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eOutlet Hi Limit AGS (Hurlcon, Astralpool, Raypak, Pentair)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/high-limit-switch-70\" title=\"70C Outlet Hi Limit HX JX Astralpool Hurlcon Gas Heaters\"\u003e\u003cstrong\u003e70C°\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eOutlet Hi Limit (Hurlcon, Astralpool HX\/JX)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/high-limit-switch-100\" title=\"100C NC High Limit Switch\"\u003e\u003cstrong\u003e100C°\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/high-limit-switch-175-hurlcon-viron-flue\" title=\"Viron Flue Temp Sensor Hi Limit\"\u003e\u003cstrong\u003e175C° \u003c\/strong\u003eFlue Temp Sensor (Hurlcon, Astralpool)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/astralpool-hurlcon-brass-plug-for-hi-limit-switches\"\u003eHurlcon \/ Astralpool HiLimit Locator Brass Threaded Plug\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eManufacturer Catalogues, Diagrams \u0026amp; Part Numbers\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eNeed exploded views, spare part numbers, product numbers, diagrams, or more product information? See the manufacturer catalogues:\n \u003ca href=\"https:\/\/hasp.com.au\/pages\/Astralpool_Catalogue_2026\"\u003eAstralpool Catalogue 2026\u003c\/a\u003e | \u003ca href=\"https:\/\/hasp.com.au\/pages\/Zodiac_Catalogue_2026\"\u003eZodiac Catalogue 2026\u003c\/a\u003e\n\u003c\/strong\u003e\u003c\/p\u003e","brand":"Astralpool","offers":[{"title":"Default Title","offer_id":31505282203705,"sku":"71060","price":63.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0372\/5253\/files\/astralpool-gas-heater-brass-plug-hi-limit-locator-m4-16mm-ici-viron-hinrg-hx-jx-mx-parts-830.webp?v=1779175281","url":"https:\/\/heaterandspaparts.com.au\/en-nz\/products\/astralpool-hurlcon-brass-plug-for-hi-limit-switches","provider":"Heater and Spa Parts","version":"1.0","type":"link"}