{"product_id":"vacuum-switch-4-5-hg-1-4-fpt-oem-replacement-part","title":"Vacuum Switch 4.5\" Hg 1\/4\" FPT – OEM Replacement Part","description":"\u003cdiv class=\"\" data-turn-id-container=\"c4adf48f-2fcf-45a4-aa46-0c7448fc1895\" data-is-intersecting=\"true\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-(--header-height)\" dir=\"auto\" data-turn-id=\"c4adf48f-2fcf-45a4-aa46-0c7448fc1895\" data-turn-id-container=\"c4adf48f-2fcf-45a4-aa46-0c7448fc1895\" data-testid=\"conversation-turn-155\" data-scroll-anchor=\"false\" data-turn=\"user\"\u003e\u003c\/section\u003e\n\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"request-6a1de47a-ac80-83ea-becb-b7236e9b681a-9\" data-is-intersecting=\"true\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-6a1de47a-ac80-83ea-becb-b7236e9b681a-9\" data-turn-id-container=\"request-6a1de47a-ac80-83ea-becb-b7236e9b681a-9\" data-testid=\"conversation-turn-156\" data-scroll-anchor=\"false\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"b84ecbaf-a265-4d1d-bc44-2e6d4704ff2f\" dir=\"auto\" data-message-model-slug=\"gpt-5-5\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\"\u003e\n\u003cp data-start=\"0\" data-end=\"183\"\u003e\u003cstrong data-start=\"0\" data-end=\"16\"\u003ePart Number:\u003c\/strong\u003e 3777\u003cbr data-start=\"47\" data-end=\"50\"\u003e\u003cstrong data-start=\"50\" data-end=\"63\"\u003eCategory:\u003c\/strong\u003e Pressure Washer Components → Vacuum Switches → Electrical Control Components\u003cbr data-start=\"140\" data-end=\"143\"\u003e\u003cstrong data-start=\"143\" data-end=\"152\"\u003eType:\u003c\/strong\u003e Vacuum Switch 4.5\" Hg 1\/4\" FPT\u003c\/p\u003e\n\u003chr data-start=\"185\" data-end=\"188\"\u003e\n\u003cp data-start=\"247\" data-end=\"656\"\u003eThe \u003cstrong data-start=\"251\" data-end=\"285\"\u003eVacuum Switch 4.5\" Hg 1\/4\" FPT\u003c\/strong\u003e is an OEM vacuum-operated electrical control device designed to monitor inlet vacuum conditions and control burner operation in hot water pressure washer systems. Installed on the pump inlet line, this switch helps verify water flow by responding to vacuum created during pump operation, ensuring that burner systems operate only when proper flow conditions are present.\u003c\/p\u003e\n\u003chr data-start=\"1337\" data-end=\"1340\"\u003e\n\u003ch2 data-section-id=\"939trr\" data-start=\"1342\" data-end=\"1368\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul data-start=\"1370\" data-end=\"1868\"\u003e\n\u003cli data-section-id=\"s7nf96\" data-start=\"1370\" data-end=\"1401\"\u003eOEM replacement vacuum switch\u003c\/li\u003e\n\u003cli data-section-id=\"2n048r\" data-start=\"1402\" data-end=\"1461\"\u003eActivates burner systems based on inlet vacuum conditions\u003c\/li\u003e\n\u003cli data-section-id=\"1org1my\" data-start=\"1462\" data-end=\"1511\"\u003eHelps verify water flow before burner operation\u003c\/li\u003e\n\u003cli data-section-id=\"1pcbzkz\" data-start=\"1512\" data-end=\"1550\"\u003ePressure-responsive diaphragm design\u003c\/li\u003e\n\u003cli data-section-id=\"6ezp62\" data-start=\"1551\" data-end=\"1603\"\u003eAutomatically opens and closes electrical circuits\u003c\/li\u003e\n\u003cli data-section-id=\"14k8v4b\" data-start=\"1604\" data-end=\"1644\"\u003eSupports safe burner control operation\u003c\/li\u003e\n\u003cli data-section-id=\"dsjvl\" data-start=\"1645\" data-end=\"1686\"\u003eIdeal for pressure washers over 4.5 GPM\u003c\/li\u003e\n\u003cli data-section-id=\"eehyc7\" data-start=\"1687\" data-end=\"1756\"\u003eSuitable for gas engine and larger electric pressure washer systems\u003c\/li\u003e\n\u003cli data-section-id=\"13mcyn2\" data-start=\"1757\" data-end=\"1822\"\u003eDurable construction for commercial and industrial applications\u003c\/li\u003e\n\u003cli data-section-id=\"rhs6aa\" data-start=\"1823\" data-end=\"1868\"\u003eHelps improve system safety and reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1870\" data-end=\"1873\"\u003e\n\u003ch2 data-section-id=\"1cgu054\" data-start=\"1875\" data-end=\"1902\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cp data-start=\"1904\" data-end=\"1935\"\u003e\u003cstrong data-start=\"1904\" data-end=\"1921\"\u003eProduct Type:\u003c\/strong\u003e Vacuum Switch\u003c\/p\u003e\n\u003cp data-start=\"1937\" data-end=\"1963\"\u003e\u003cstrong data-start=\"1937\" data-end=\"1955\"\u003eVacuum Rating:\u003c\/strong\u003e 4.5\" Hg\u003c\/p\u003e\n\u003cp data-start=\"1965\" data-end=\"1994\"\u003e\u003cstrong data-start=\"1965\" data-end=\"1985\"\u003eConnection Size:\u003c\/strong\u003e 1\/4\" FPT\u003c\/p\u003e\n\u003cp data-start=\"1996\" data-end=\"2037\"\u003e\u003cstrong data-start=\"1996\" data-end=\"2012\"\u003eThread Type:\u003c\/strong\u003e Female Pipe Thread (FPT)\u003c\/p\u003e\n\u003cp data-start=\"2039\" data-end=\"2125\"\u003e\u003cstrong data-start=\"2039\" data-end=\"2067\"\u003eRecommended Application:\u003c\/strong\u003e Gas Engine Pressure Washers \u0026amp; Electric Units Over 4.5 GPM\u003c\/p\u003e\n\u003cp data-start=\"2127\" data-end=\"2157\"\u003e\u003cstrong data-start=\"2127\" data-end=\"2151\"\u003eMaximum Temperature:\u003c\/strong\u003e 140°F\u003c\/p\u003e\n\u003cp data-start=\"2159\" data-end=\"2198\"\u003e\u003cstrong data-start=\"2159\" data-end=\"2179\"\u003eEquivalent Part:\u003c\/strong\u003e 0017 Vacuum Switch\u003c\/p\u003e\n\u003cp data-start=\"2200\" data-end=\"2220\"\u003e\u003cstrong data-start=\"2200\" data-end=\"2211\"\u003eWeight:\u003c\/strong\u003e 1.2 lbs.\u003c\/p\u003e\n\u003cp data-start=\"2222\" data-end=\"2260\"\u003e\u003cstrong data-start=\"2222\" data-end=\"2238\"\u003eApplication:\u003c\/strong\u003e Burner \u0026amp; Flow Control\u003c\/p\u003e\n\u003cp data-start=\"2262\" data-end=\"2286\"\u003e\u003cstrong data-start=\"2262\" data-end=\"2282\"\u003eOEM Replacement:\u003c\/strong\u003e Yes\u003c\/p\u003e\n\u003chr data-start=\"2288\" data-end=\"2291\"\u003e\n\u003ch2 data-section-id=\"164os46\" data-start=\"2293\" data-end=\"2316\"\u003eTypical Applications\u003c\/h2\u003e\n\u003cul data-start=\"2318\" data-end=\"2583\"\u003e\n\u003cli data-section-id=\"g7mqf6\" data-start=\"2318\" data-end=\"2346\"\u003eHot water pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"10ry8wq\" data-start=\"2347\" data-end=\"2383\"\u003eGas engine pressure washer systems\u003c\/li\u003e\n\u003cli data-section-id=\"1eso8gm\" data-start=\"2384\" data-end=\"2421\"\u003eHigh-flow electric pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"k7ien9\" data-start=\"2422\" data-end=\"2446\"\u003eBurner control systems\u003c\/li\u003e\n\u003cli data-section-id=\"s1usdo\" data-start=\"2447\" data-end=\"2479\"\u003eFuel solenoid control circuits\u003c\/li\u003e\n\u003cli data-section-id=\"n48o3f\" data-start=\"2480\" data-end=\"2511\"\u003eCommercial cleaning equipment\u003c\/li\u003e\n\u003cli data-section-id=\"e9p5qp\" data-start=\"2512\" data-end=\"2549\"\u003eIndustrial pressure washing systems\u003c\/li\u003e\n\u003cli data-section-id=\"wjtvuo\" data-start=\"2550\" data-end=\"2583\"\u003eWater flow verification systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2585\" data-end=\"2588\"\u003e\n\u003ch2 data-section-id=\"7zbpd1\" data-start=\"2590\" data-end=\"2615\"\u003ePerformance Advantages\u003c\/h2\u003e\n\u003cul data-start=\"2617\" data-end=\"3112\"\u003e\n\u003cli data-section-id=\"1gifvis\" data-start=\"2617\" data-end=\"2683\"\u003eHelps ensure burner operation only when proper water flow exists\u003c\/li\u003e\n\u003cli data-section-id=\"1jr9h19\" data-start=\"2684\" data-end=\"2743\"\u003eAutomatically interrupts burner operation when flow stops\u003c\/li\u003e\n\u003cli data-section-id=\"3r7d0z\" data-start=\"2744\" data-end=\"2799\"\u003eSupports safe operation of hot water pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"1p0g479\" data-start=\"2800\" data-end=\"2849\"\u003eReliable diaphragm-operated switching mechanism\u003c\/li\u003e\n\u003cli data-section-id=\"131718r\" data-start=\"2850\" data-end=\"2910\"\u003eReduces the risk of burner operation without adequate flow\u003c\/li\u003e\n\u003cli data-section-id=\"18f0j44\" data-start=\"2911\" data-end=\"2956\"\u003eSuitable for larger pressure washer systems\u003c\/li\u003e\n\u003cli data-section-id=\"18sppfq\" data-start=\"2957\" data-end=\"3006\"\u003eDurable construction for demanding environments\u003c\/li\u003e\n\u003cli data-section-id=\"12xf3jg\" data-start=\"3007\" data-end=\"3055\"\u003eImproves overall system reliability and safety\u003c\/li\u003e\n\u003cli data-section-id=\"74coh8\" data-start=\"3056\" data-end=\"3112\"\u003eEasy integration into existing burner control circuits\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3114\" data-end=\"3117\"\u003e\n\u003ch2 data-section-id=\"3njkry\" data-start=\"3119\" data-end=\"3146\"\u003eImportant Operating Note\u003c\/h2\u003e\n\u003cp data-start=\"3148\" data-end=\"3484\"\u003eA potential issue can occur if the \u003cstrong data-start=\"3183\" data-end=\"3263\"\u003einlet filter, water supply line, or float tank becomes clogged or restricted\u003c\/strong\u003e. In this situation, the pump may continue operating while creating excessive vacuum on the inlet side. This vacuum condition can keep the switch closed and allow burner operation even though water supply is insufficient.\u003c\/p\u003e\n\u003cp data-start=\"3486\" data-end=\"3507\"\u003eFor proper operation:\u003c\/p\u003e\n\u003cul data-start=\"3509\" data-end=\"3736\"\u003e\n\u003cli data-section-id=\"mu8ms6\" data-start=\"3509\" data-end=\"3543\"\u003eInspect inlet filters regularly.\u003c\/li\u003e\n\u003cli data-section-id=\"1hbkycg\" data-start=\"3544\" data-end=\"3586\"\u003eKeep float tanks clean and unobstructed.\u003c\/li\u003e\n\u003cli data-section-id=\"1m06rbl\" data-start=\"3587\" data-end=\"3631\"\u003eVerify adequate water supply at all times.\u003c\/li\u003e\n\u003cli data-section-id=\"1bha2pj\" data-start=\"3632\" data-end=\"3677\"\u003eCorrect any inlet restrictions immediately.\u003c\/li\u003e\n\u003cli data-section-id=\"mj204u\" data-start=\"3678\" data-end=\"3736\"\u003eTest vacuum switch operation during routine maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3738\" data-end=\"3741\"\u003e\n\u003ch2 data-section-id=\"8fimbm\" data-start=\"3743\" data-end=\"3773\"\u003eMaintenance Recommendations\u003c\/h2\u003e\n\u003cul data-start=\"3775\" data-end=\"4145\"\u003e\n\u003cli data-section-id=\"1vpj8us\" data-start=\"3775\" data-end=\"3818\"\u003eInspect electrical connections regularly.\u003c\/li\u003e\n\u003cli data-section-id=\"qv53mz\" data-start=\"3819\" data-end=\"3901\"\u003eVerify switch activation and burner shutdown functions during service intervals.\u003c\/li\u003e\n\u003cli data-section-id=\"xih8x7\" data-start=\"3902\" data-end=\"3968\"\u003eCheck inlet plumbing, filters, and float tanks for restrictions.\u003c\/li\u003e\n\u003cli data-section-id=\"1omdhww\" data-start=\"3969\" data-end=\"4031\"\u003eInspect the diaphragm and switch housing for wear or damage.\u003c\/li\u003e\n\u003cli data-section-id=\"mxzrjc\" data-start=\"4032\" data-end=\"4078\"\u003eReplace malfunctioning switches immediately.\u003c\/li\u003e\n\u003cli data-section-id=\"13ghpm9\" data-start=\"4079\" data-end=\"4145\"\u003eFollow manufacturer installation and troubleshooting procedures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e","brand":"Mecline","offers":[{"title":"Default Title","offer_id":53339193344363,"sku":null,"price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0917\/9201\/5723\/files\/GeneralSprayers_Logo_250x250_1_4717f2ee-8f00-42eb-a83a-50a336496221.png?v=1780499838","url":"https:\/\/generalsprayers.com\/products\/vacuum-switch-4-5-hg-1-4-fpt-oem-replacement-part","provider":"GeneralSprayers","version":"1.0","type":"link"}