{"product_id":"pa-vb10-yu3678-pressure-washer-unloader-valve-8-gpm-3650-psi-oem-replacement-part","title":"PA VB10\/YU3678 Pressure Washer Unloader Valve 8 GPM 3650 PSI – OEM Replacement Part","description":"\u003cdiv class=\"\" data-turn-id-container=\"1a65568f-7e0a-45ce-922a-fb5ece433045\" 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-(--sticky-padding-top)\" dir=\"auto\" data-turn-id=\"1a65568f-7e0a-45ce-922a-fb5ece433045\" data-turn-id-container=\"1a65568f-7e0a-45ce-922a-fb5ece433045\" data-testid=\"conversation-turn-569\" data-turn=\"user\"\u003e\u003c\/section\u003e\n\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"request-6a35562f-a1fc-83ea-bfdd-f10b85f84e9a-16\" 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-6a35562f-a1fc-83ea-bfdd-f10b85f84e9a-16\" data-turn-id-container=\"request-6a35562f-a1fc-83ea-bfdd-f10b85f84e9a-16\" data-testid=\"conversation-turn-570\" 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 data-conversation-screenshot-content=\"\" 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=\"0e843d1b-e8bd-46d5-bd71-676178f269dc\" 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=\"173\"\u003e\u003cstrong data-start=\"0\" data-end=\"16\"\u003ePart Number:\u003c\/strong\u003e 4213\u003cbr data-start=\"21\" data-end=\"24\"\u003e\u003cstrong data-start=\"24\" data-end=\"37\"\u003eCategory:\u003c\/strong\u003e Pressure Washer Parts → Unloader Valves → Pressure Actuated Unloader Valves\u003cbr data-start=\"113\" data-end=\"116\"\u003e\u003cstrong data-start=\"116\" data-end=\"125\"\u003eType:\u003c\/strong\u003e PA VB10 \/ YU3678 Pressure Washer Unloader Valve\u003c\/p\u003e\n\u003chr data-start=\"175\" data-end=\"178\"\u003e\n\u003cp data-start=\"273\" data-end=\"767\"\u003eThe \u003cstrong data-start=\"277\" data-end=\"339\"\u003ePA VB10\/YU3678 Pressure Washer Unloader Valve (Part #4213)\u003c\/strong\u003e is a genuine OEM replacement pressure-actuated unloader designed for commercial and industrial pressure washer systems operating up to \u003cstrong data-start=\"475\" data-end=\"484\"\u003e8 GPM\u003c\/strong\u003e and \u003cstrong data-start=\"489\" data-end=\"502\"\u003e3,650 PSI\u003c\/strong\u003e. Manufactured by \u003cstrong data-start=\"520\" data-end=\"538\"\u003ePA (PA S.p.A.)\u003c\/strong\u003e, this heavy-duty unloader automatically regulates system pressure by diverting water into bypass mode whenever the spray gun is closed, helping protect the pump and other high-pressure components from excessive pressure buildup.\u003c\/p\u003e\n\u003chr data-start=\"1346\" data-end=\"1349\"\u003e\n\u003ch2 data-section-id=\"939trr\" data-start=\"1351\" data-end=\"1377\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul data-start=\"1379\" data-end=\"1887\"\u003e\n\u003cli data-section-id=\"18wuel5\" data-start=\"1379\" data-end=\"1422\"\u003eGenuine PA OEM replacement unloader valve\u003c\/li\u003e\n\u003cli data-section-id=\"7b3l7s\" data-start=\"1423\" data-end=\"1459\"\u003ePressure-actuated bypass operation\u003c\/li\u003e\n\u003cli data-section-id=\"19yn55\" data-start=\"1460\" data-end=\"1487\"\u003eRated for up to \u003cstrong data-start=\"1478\" data-end=\"1487\"\u003e8 GPM\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"cat5h3\" data-start=\"1488\" data-end=\"1533\"\u003eMaximum operating pressure of \u003cstrong data-start=\"1520\" data-end=\"1533\"\u003e3,650 PSI\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1tzc7f5\" data-start=\"1534\" data-end=\"1580\"\u003eProtects pumps from damaging pressure spikes\u003c\/li\u003e\n\u003cli data-section-id=\"1bocrxz\" data-start=\"1581\" data-end=\"1618\"\u003eMaintains stable operating pressure\u003c\/li\u003e\n\u003cli data-section-id=\"7dzq54\" data-start=\"1619\" data-end=\"1658\"\u003eDurable commercial-grade construction\u003c\/li\u003e\n\u003cli data-section-id=\"3u46tj\" data-start=\"1659\" data-end=\"1709\"\u003eSuitable for hot and cold water pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"2orbya\" data-start=\"1710\" data-end=\"1739\"\u003eReliable bypass performance\u003c\/li\u003e\n\u003cli data-section-id=\"zty4uj\" data-start=\"1740\" data-end=\"1796\"\u003eLong service life under demanding operating conditions\u003c\/li\u003e\n\u003cli data-section-id=\"3iwt53\" data-start=\"1797\" data-end=\"1830\"\u003eOEM-quality fit and performance\u003c\/li\u003e\n\u003cli data-section-id=\"lcvjih\" data-start=\"1831\" data-end=\"1887\"\u003eIdeal for commercial and industrial cleaning equipment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1889\" data-end=\"1892\"\u003e\n\u003ch2 data-section-id=\"1cgu054\" data-start=\"1894\" data-end=\"1921\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cp data-start=\"1923\" data-end=\"1944\"\u003e\u003cstrong data-start=\"1923\" data-end=\"1939\"\u003ePart Number:\u003c\/strong\u003e 4213\u003c\/p\u003e\n\u003cp data-start=\"1946\" data-end=\"1978\"\u003e\u003cstrong data-start=\"1946\" data-end=\"1963\"\u003eManufacturer:\u003c\/strong\u003e PA (PA S.p.A.)\u003c\/p\u003e\n\u003cp data-start=\"1980\" data-end=\"2004\"\u003e\u003cstrong data-start=\"1980\" data-end=\"1990\"\u003eModel:\u003c\/strong\u003e VB10 \/ YU3678\u003c\/p\u003e\n\u003cp data-start=\"2006\" data-end=\"2056\"\u003e\u003cstrong data-start=\"2006\" data-end=\"2023\"\u003eProduct Type:\u003c\/strong\u003e Pressure Actuated Unloader Valve\u003c\/p\u003e\n\u003cp data-start=\"2058\" data-end=\"2086\"\u003e\u003cstrong data-start=\"2058\" data-end=\"2080\"\u003eMaximum Flow Rate:\u003c\/strong\u003e 8 GPM\u003c\/p\u003e\n\u003cp data-start=\"2088\" data-end=\"2119\"\u003e\u003cstrong data-start=\"2088\" data-end=\"2109\"\u003eMaximum Pressure:\u003c\/strong\u003e 3,650 PSI\u003c\/p\u003e\n\u003cp data-start=\"2121\" data-end=\"2151\"\u003e\u003cstrong data-start=\"2121\" data-end=\"2145\"\u003eMaximum Temperature:\u003c\/strong\u003e 195°F\u003c\/p\u003e\n\u003cp data-start=\"2153\" data-end=\"2183\"\u003e\u003cstrong data-start=\"2153\" data-end=\"2174\"\u003eInlet Connection:\u003c\/strong\u003e 3\/8\" FPT\u003c\/p\u003e\n\u003cp data-start=\"2185\" data-end=\"2216\"\u003e\u003cstrong data-start=\"2185\" data-end=\"2207\"\u003eOutlet Connection:\u003c\/strong\u003e 3\/8\" FPT\u003c\/p\u003e\n\u003cp data-start=\"2218\" data-end=\"2255\"\u003e\u003cstrong data-start=\"2218\" data-end=\"2237\"\u003eOperation Type:\u003c\/strong\u003e Pressure Actuated\u003c\/p\u003e\n\u003cp data-start=\"2257\" data-end=\"2281\"\u003e\u003cstrong data-start=\"2257\" data-end=\"2277\"\u003eOEM Replacement:\u003c\/strong\u003e Yes\u003c\/p\u003e\n\u003chr data-start=\"2283\" data-end=\"2286\"\u003e\n\u003ch2 data-section-id=\"hdd61u\" data-start=\"2288\" data-end=\"2316\"\u003eHow the VB10\/YU3678 Works\u003c\/h2\u003e\n\u003cp data-start=\"2318\" data-end=\"2400\"\u003eThe VB10\/YU3678 automatically controls pressure within the pressure washer system.\u003c\/p\u003e\n\u003cp data-start=\"2402\" data-end=\"2433\"\u003eWhen the spray gun is released:\u003c\/p\u003e\n\u003cul data-start=\"2435\" data-end=\"2653\"\u003e\n\u003cli data-section-id=\"13yzrt6\" data-start=\"2435\" data-end=\"2471\"\u003eSystem pressure rapidly increases.\u003c\/li\u003e\n\u003cli data-section-id=\"4fv4vv\" data-start=\"2472\" data-end=\"2517\"\u003eThe unloader valve shifts into bypass mode.\u003c\/li\u003e\n\u003cli data-section-id=\"e9u09n\" data-start=\"2518\" data-end=\"2567\"\u003eWater is diverted away from the discharge line.\u003c\/li\u003e\n\u003cli data-section-id=\"koup7m\" data-start=\"2568\" data-end=\"2598\"\u003eExcess pressure is relieved.\u003c\/li\u003e\n\u003cli data-section-id=\"xizxgq\" data-start=\"2599\" data-end=\"2653\"\u003eThe pump and high-pressure components are protected.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2655\" data-end=\"2692\"\u003eWhen the trigger gun is pulled again:\u003c\/p\u003e\n\u003cul data-start=\"2694\" data-end=\"2800\"\u003e\n\u003cli data-section-id=\"1t8rtl5\" data-start=\"2694\" data-end=\"2729\"\u003eWater flow returns to the outlet.\u003c\/li\u003e\n\u003cli data-section-id=\"127fyrf\" data-start=\"2730\" data-end=\"2768\"\u003eFull operating pressure is restored.\u003c\/li\u003e\n\u003cli data-section-id=\"egikwd\" data-start=\"2769\" data-end=\"2800\"\u003eCleaning resumes immediately.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2802\" data-end=\"2907\"\u003eThis automatic operation helps maximize equipment life while maintaining consistent cleaning performance.\u003c\/p\u003e\n\u003chr data-start=\"2909\" data-end=\"2912\"\u003e\n\u003ch2 data-section-id=\"vx2wyp\" data-start=\"2914\" data-end=\"2936\"\u003eCommon Applications\u003c\/h2\u003e\n\u003ch3 data-section-id=\"1m7fp76\" data-start=\"2938\" data-end=\"2969\"\u003eCommercial Pressure Washing\u003c\/h3\u003e\n\u003cp data-start=\"2971\" data-end=\"2981\"\u003eIdeal for:\u003c\/p\u003e\n\u003cul data-start=\"2983\" data-end=\"3133\"\u003e\n\u003cli data-section-id=\"1mppnl2\" data-start=\"2983\" data-end=\"3017\"\u003eMobile pressure washing trailers\u003c\/li\u003e\n\u003cli data-section-id=\"1hqs11v\" data-start=\"3018\" data-end=\"3050\"\u003eProperty maintenance companies\u003c\/li\u003e\n\u003cli data-section-id=\"ggeu2l\" data-start=\"3051\" data-end=\"3077\"\u003eFleet washing operations\u003c\/li\u003e\n\u003cli data-section-id=\"1q5rf75\" data-start=\"3078\" data-end=\"3106\"\u003eBuilding exterior cleaning\u003c\/li\u003e\n\u003cli data-section-id=\"167zffo\" data-start=\"3107\" data-end=\"3133\"\u003eHeavy equipment cleaning\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"cl0b4i\" data-start=\"3135\" data-end=\"3166\"\u003eIndustrial Cleaning Systems\u003c\/h3\u003e\n\u003cp data-start=\"3168\" data-end=\"3181\"\u003eSuitable for:\u003c\/p\u003e\n\u003cul data-start=\"3183\" data-end=\"3334\"\u003e\n\u003cli data-section-id=\"1i0u86j\" data-start=\"3183\" data-end=\"3209\"\u003eManufacturing facilities\u003c\/li\u003e\n\u003cli data-section-id=\"9bm7jy\" data-start=\"3210\" data-end=\"3243\"\u003eAgricultural equipment cleaning\u003c\/li\u003e\n\u003cli data-section-id=\"wxmp63\" data-start=\"3244\" data-end=\"3266\"\u003eIndustrial wash bays\u003c\/li\u003e\n\u003cli data-section-id=\"10tc7t6\" data-start=\"3267\" data-end=\"3302\"\u003eMunicipal maintenance departments\u003c\/li\u003e\n\u003cli data-section-id=\"58a71c\" data-start=\"3303\" data-end=\"3334\"\u003eService and repair facilities\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"6j53bi\" data-start=\"3336\" data-end=\"3373\"\u003eHot \u0026amp; Cold Water Pressure Washers\u003c\/h3\u003e\n\u003cp data-start=\"3375\" data-end=\"3391\"\u003eCompatible with:\u003c\/p\u003e\n\u003cul data-start=\"3393\" data-end=\"3552\"\u003e\n\u003cli data-section-id=\"e1w54q\" data-start=\"3393\" data-end=\"3422\"\u003eBelt-drive pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"1d973ig\" data-start=\"3423\" data-end=\"3454\"\u003eDirect-drive pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"126j2d9\" data-start=\"3455\" data-end=\"3483\"\u003eHot water cleaning systems\u003c\/li\u003e\n\u003cli data-section-id=\"1l5zndh\" data-start=\"3484\" data-end=\"3513\"\u003eCold water pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"hh0mx\" data-start=\"3514\" data-end=\"3552\"\u003eCustom-built pressure washer systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3554\" data-end=\"3557\"\u003e\n\u003ch2 data-section-id=\"ctfpuh\" data-start=\"3559\" data-end=\"3582\"\u003ePerformance Benefits\u003c\/h2\u003e\n\u003cul data-start=\"3584\" data-end=\"3809\"\u003e\n\u003cli data-section-id=\"1bl7wox\" data-start=\"3584\" data-end=\"3614\"\u003eReliable pressure regulation\u003c\/li\u003e\n\u003cli data-section-id=\"1nzrik5\" data-start=\"3615\" data-end=\"3640\"\u003eSmooth bypass operation\u003c\/li\u003e\n\u003cli data-section-id=\"1bb2u3x\" data-start=\"3641\" data-end=\"3667\"\u003eImproved pump protection\u003c\/li\u003e\n\u003cli data-section-id=\"1ero2xq\" data-start=\"3668\" data-end=\"3693\"\u003eReduced pressure spikes\u003c\/li\u003e\n\u003cli data-section-id=\"jtaebh\" data-start=\"3694\" data-end=\"3721\"\u003eStable operating pressure\u003c\/li\u003e\n\u003cli data-section-id=\"1gpagnp\" data-start=\"3722\" data-end=\"3755\"\u003eConsistent cleaning performance\u003c\/li\u003e\n\u003cli data-section-id=\"1oa16xv\" data-start=\"3756\" data-end=\"3781\"\u003eExtended equipment life\u003c\/li\u003e\n\u003cli data-section-id=\"1fswne1\" data-start=\"3782\" data-end=\"3809\"\u003eReduced maintenance costs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3811\" data-end=\"3814\"\u003e\n\u003ch2 data-section-id=\"x2tt67\" data-start=\"3816\" data-end=\"3860\"\u003eSigns an Unloader Valve Needs Replacement\u003c\/h2\u003e\n\u003cp data-start=\"3862\" data-end=\"3905\"\u003eInspect or replace the valve if you notice:\u003c\/p\u003e\n\u003cul data-start=\"3907\" data-end=\"4123\"\u003e\n\u003cli data-section-id=\"zta6im\" data-start=\"3907\" data-end=\"3930\"\u003ePressure fluctuations\u003c\/li\u003e\n\u003cli data-section-id=\"1g7kb8v\" data-start=\"3931\" data-end=\"3963\"\u003eWater leakage around the valve\u003c\/li\u003e\n\u003cli data-section-id=\"irubn0\" data-start=\"3964\" data-end=\"3991\"\u003eReduced cleaning pressure\u003c\/li\u003e\n\u003cli data-section-id=\"1vz4ts\" data-start=\"3992\" data-end=\"4023\"\u003eInconsistent bypass operation\u003c\/li\u003e\n\u003cli data-section-id=\"1n6rxvr\" data-start=\"4024\" data-end=\"4050\"\u003eDelayed trigger response\u003c\/li\u003e\n\u003cli data-section-id=\"xgt66y\" data-start=\"4051\" data-end=\"4094\"\u003eDifficulty maintaining operating pressure\u003c\/li\u003e\n\u003cli data-section-id=\"wk4w4r\" data-start=\"4095\" data-end=\"4123\"\u003eInternal wear or corrosion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4125\" data-end=\"4128\"\u003e\n\u003ch2 data-section-id=\"16dprsq\" data-start=\"4130\" data-end=\"4151\"\u003eInstallation Notes\u003c\/h2\u003e\n\u003col data-start=\"4153\" data-end=\"4536\"\u003e\n\u003cli data-section-id=\"a84wcd\" data-start=\"4153\" data-end=\"4231\"\u003eVerify compatibility with your pressure washer's flow and pressure ratings.\u003c\/li\u003e\n\u003cli data-section-id=\"ycqzw3\" data-start=\"4232\" data-end=\"4304\"\u003eInstall using appropriate thread sealant on all threaded connections.\u003c\/li\u003e\n\u003cli data-section-id=\"1avwt5b\" data-start=\"4305\" data-end=\"4351\"\u003eEnsure all plumbing connections are secure.\u003c\/li\u003e\n\u003cli data-section-id=\"18yjxvd\" data-start=\"4352\" data-end=\"4399\"\u003eTest the pressure washer after installation.\u003c\/li\u003e\n\u003cli data-section-id=\"b13ssh\" data-start=\"4400\" data-end=\"4457\"\u003eVerify proper bypass operation and operating pressure.\u003c\/li\u003e\n\u003cli data-section-id=\"1dtav2j\" data-start=\"4458\" data-end=\"4536\"\u003eAdjust system pressure according to equipment specifications if applicable.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp data-start=\"4538\" data-end=\"4713\"\u003e\u003cstrong data-start=\"4538\" data-end=\"4552\"\u003eImportant:\u003c\/strong\u003e Always ensure that pumps, hoses, spray guns, and fittings are rated for the system's maximum operating pressure before placing the pressure washer into service.\u003c\/p\u003e\n\u003chr data-start=\"4715\" data-end=\"4718\"\u003e\n\u003ch2 data-section-id=\"8fimbm\" data-start=\"4720\" data-end=\"4750\"\u003eMaintenance Recommendations\u003c\/h2\u003e\n\u003cul data-start=\"4752\" data-end=\"5060\"\u003e\n\u003cli data-section-id=\"vakiz1\" data-start=\"4752\" data-end=\"4804\"\u003eInspect the unloader regularly for leaks and wear.\u003c\/li\u003e\n\u003cli data-section-id=\"14fdjhg\" data-start=\"4805\" data-end=\"4865\"\u003eVerify proper bypass operation during routine maintenance.\u003c\/li\u003e\n\u003cli data-section-id=\"jd9knh\" data-start=\"4866\" data-end=\"4906\"\u003eMaintain clean inlet water filtration.\u003c\/li\u003e\n\u003cli data-section-id=\"1rklumh\" data-start=\"4907\" data-end=\"4960\"\u003eMonitor system pressure for consistent performance.\u003c\/li\u003e\n\u003cli data-section-id=\"1upfe9e\" data-start=\"4961\" data-end=\"5013\"\u003eReplace worn seals or rebuild the valve as needed.\u003c\/li\u003e\n\u003cli data-section-id=\"1eu3yoy\" data-start=\"5014\" data-end=\"5060\"\u003eFollow PA recommended maintenance intervals.\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":"PA","offers":[{"title":"Default Title","offer_id":53431337288043,"sku":null,"price":150.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0917\/9201\/5723\/files\/PA4213UNLOADER.webp?v=1782604550","url":"https:\/\/generalsprayers.com\/products\/pa-vb10-yu3678-pressure-washer-unloader-valve-8-gpm-3650-psi-oem-replacement-part","provider":"GeneralSprayers","version":"1.0","type":"link"}