{"product_id":"pentairwaterpoolandspainc_51008400","title":"Pentair Spider Gasket 1-1\/2\" Side Mount MultiPort Valve | Sta-Rite | 51008400","description":"\u003ch3\u003eOEM Spider Gasket for the Sta-Rite 1-1\/2\" Side Mount MultiPort Valve\u003c\/h3\u003e\n\u003cp\u003eThe Pentair 51008400 is the OEM replacement spider gasket for the Sta-Rite 1-1\/2\" side mount multiport valve. If your multiport valve is leaking between port positions or allowing water to bypass the selected port, a worn or cracked spider gasket is the most common cause — this is the correct replacement part.\u003c\/p\u003e\n\u003ch3\u003eWhat It Does\u003c\/h3\u003e\n\u003cp\u003eThe spider gasket sits inside the multiport valve body and seals each port channel as the valve handle rotates through its positions (Filter, Backwash, Rinse, Waste, Recirculate, Closed). When the gasket deteriorates, water migrates between ports, causing backwash water to return to the pool or filter media to bypass the tank entirely. Replacing the spider gasket restores clean port-to-port sealing and correct valve function.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0; border: 1px solid #ccc;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003ePentair Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e51008400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eAlso Known As \/ Legacy Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003ePentair (formerly Sta-Rite) — Sta-Rite 1-1\/2\" Side Mount MultiPort Valve Spider Gasket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eValve Connection Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e1-1\/2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eValve Mount Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eSide Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eQuantity Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003ePro Tip\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, confirm the connection size and mount type stamped on your existing valve body — Sta-Rite multiport valves were produced in both 1-1\/2\" and 2\" side mount configurations, and the spider gaskets are not interchangeable between sizes. If you can see the original part number on the gasket itself or in your filter's parts diagram, match it to 51008400 before adding to cart.\u003c\/p\u003e\n\u003c!-- wft:processed:manual:2026-04-04 --\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":53932870336787,"sku":"51008400","price":35.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/pentair-spider-gasket-1-1-2-side-mount-multiport-valve-sta-rite-51008400.webp?v=1780411380","url":"https:\/\/poolaroo.com\/products\/pentairwaterpoolandspainc_51008400","provider":"Poolaroo","version":"1.0","type":"link"}