{"product_id":"polaris3900sportwatermanagementassemblyworing39300pls39300","title":"Polaris 3900 Sport Water Management Assembly w\/ O-Ring | 39-300","description":"\u003cdiv\u003e\n  \u003ch2\u003ePolaris 39-300 Water Management System (WMS) Assembly with O-Ring – For Polaris 3900 Sport\u003c\/h2\u003e\n\n  \u003cp\u003e\n    The Polaris \u003cstrong\u003e39-300\u003c\/strong\u003e is a replacement \u003cstrong\u003eWater Management System (WMS) assembly\u003c\/strong\u003e (includes O-ring) for the\n    \u003cstrong\u003ePolaris 3900 Sport\u003c\/strong\u003e pressure-side pool cleaner. The WMS is a key internal water-routing component that helps direct incoming\n    water through the cleaner’s intake\/jet channels to maintain strong pickup and consistent cleaning performance.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eKey Features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 39-300\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Water Management System (WMS) assembly\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e O-ring (for a proper seal during installation)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCompatible Cleaner:\u003c\/strong\u003e Polaris 3900 Sport\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Directs water flow inside the cleaner to support strong debris intake and stable movement\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eCommon Signs It’s Time to Replace\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eCleaner has reduced suction\/pickup even with good pressure and a clean wall screen\u003c\/li\u003e\n    \u003cli\u003eInconsistent performance (surging, weak intake, or poor debris collection)\u003c\/li\u003e\n    \u003cli\u003eCracks, warping, or visible damage on the WMS body\u003c\/li\u003e\n    \u003cli\u003eWater leakage at the WMS sealing area (flattened or damaged O-ring\/sealing surfaces)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eShut off the booster pump and remove the cleaner from the pool before servicing.\u003c\/li\u003e\n    \u003cli\u003eInstall the WMS assembly in the same orientation as the original part.\u003c\/li\u003e\n    \u003cli\u003eEnsure the included O-ring is seated properly and the sealing surfaces are clean before reassembly.\u003c\/li\u003e\n    \u003cli\u003eAfter reassembly, verify the cleaner operates smoothly and debris pickup is restored.\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=polaris%203900%20sport%20parts\"\u003ePolaris 3900 Sport Parts\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=polaris%203900%20sport%20rebuild%20kit\"\u003ePolaris 3900 Sport Rebuild Kits\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=polaris%203900%20sport%20bag\"\u003ePolaris 3900 Sport Debris Bags\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=polaris%20backup%20valve%203900\"\u003ePolaris Back-Up Valve (3900 Sport)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=polaris%20wall%20fitting%20screen\"\u003ePolaris Wall Fitting Screens\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=silicone%20pool%20lube\"\u003eSilicone Pool Lubricant\u003c\/a\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eInstallation \u0026amp; Maintenance Tips\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eClean the wall fitting screen\/filter regularly—restricted flow can mimic internal cleaner problems.\u003c\/li\u003e\n    \u003cli\u003eRinse the cleaner after heavy debris events to reduce grit buildup that accelerates wear on internal water-routing parts.\u003c\/li\u003e\n    \u003cli\u003eUse only a light film of silicone lube on O-rings to improve sealing and reduce pinching during assembly (avoid petroleum grease).\u003c\/li\u003e\n    \u003cli\u003eIf performance is still weak after replacement, inspect feed hose sections for pinhole leaks and confirm proper booster pump pressure.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n","brand":"Polaris","offers":[{"title":"Default Title","offer_id":52589956038972,"sku":"39-300","price":37.99,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aquapoolsupply.com\/products\/polaris3900sportwatermanagementassemblyworing39300pls39300","provider":"Aqua Pool Supply","version":"1.0","type":"link"}