{"product_id":"pentairwaterpoolandspainc_273550z","title":"Pentair Black Manual Air Relief Assembly | SM \u0026 SMBW 4000 Series D.E. Filter, FNS Filter, Nautilus Plus Filter | 273550Z","description":"\u003ch3\u003eOEM Replacement Manual Air Relief Assembly for Pentair D.E. and Cartridge Filters\u003c\/h3\u003e\n\n\u003cp\u003eThe Pentair Black Manual Air Relief Assembly (273550Z) is the OEM replacement air relief assembly for the SM and SMBW 4000 Series D.E. Filter, FNS Filter, and Nautilus Plus Filter product lines.\u003c\/p\u003e\n\n\u003cp style=\"background-color: #fff3cd; border: 2px solid #FFEAA7; padding: 15px; border-radius: 5px; margin: 15px 0; color: #856404;\"\u003e\u003cstrong\u003eIMPORTANT: CONFIRM COLOR BEFORE ORDERING\u003c\/strong\u003e\u003cbr\u003eThis is the BLACK version of the air relief assembly. Pentair produces this assembly in multiple color variants for different filter configurations. Confirm the color on your existing assembly matches Black (273550Z) before ordering — the wrong color variant may not seat correctly in your filter's air relief port.\u003c\/p\u003e\n\n\u003cp\u003eThe manual air relief assembly allows trapped air to be purged from the filter tank before and after servicing, restoring proper water flow and system pressure. A failed or leaking air relief assembly can prevent accurate pressure readings and allow air locks to develop within the filter, reducing filtration efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0; border: 1px solid #ccc;\"\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;\"\u003e273550Z\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eBlack\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 Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePro Tip\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, locate the existing air relief assembly on your filter and confirm the color matches Black (273550Z). Pentair supplies this assembly in multiple color variants corresponding to different filter configurations — ordering the wrong color variant may result in a part that does not seat correctly in your filter's air relief port. If you are unsure of your filter's model number, it is stamped on the filter tank label.\u003c\/p\u003e\n\n\u003c!-- wft:processed:manual:2026-04-16 --\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":53960097693971,"sku":"273550Z","price":110.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/pentair-black-manual-air-relief-assembly-sm-smbw-4000-series-d-e-filter-fns-filter-nautilus-plus-fil-3.webp?v=1776436020","url":"https:\/\/poolaroo.com\/products\/pentairwaterpoolandspainc_273550z","provider":"Poolaroo","version":"1.0","type":"link"}