{"product_id":"pentair-21-and-25-upper-tank-fitting","title":"Pentair 21\" and 25\" Upper Tank Fitting","description":"\u003cp data-path-to-node=\"0\"\u003eThe Pentair Sta-Rite System 3 Upper Tank Fitting (part number 24900-0501 or 24900-0501Z) is a specialized structural plumbing interface component engineered exclusively for the dual-shell casing of Pentair Sta-Rite System 3 high-rate pool and spa sand filtration systems. This heavy-duty bulkhead fitting is standard hardware for both the 21-inch and 25-inch tank models within the SS-Series (specifically models S7S50 and S8S70).\u003c\/p\u003e\n\u003cp data-path-to-node=\"1\"\u003eInjection-molded from a thick-walled, high-impact, and chemically inert black polymer composite, this component measures approximately 6 inches in length, 4.5 inches in height, and 4.5 inches in width. Its primary operational role is to pierce the upper vertical wall of the Dura-Glas™ composite tank shell, creating a rigid, unyielding mechanical port that bridges the internal fluid distribution manifold with the external pool return plumbing or multi-port backwash valve network. When locked tightly in place over its corresponding sealing gaskets and bulkhead O-rings, it establishes an absolute watertight and airtight compression boundary. This ensures that the high-capacity vessel can safely route massive, pressurized water volumes and sustain continuous internal operating pressures up to 50 PSI without weeping, experiencing localized thread stress, or risking structural joint separation under heavy pump vibration surges.\u003c\/p\u003e\n\u003cp data-path-to-node=\"2\"\u003eEngineered to endure a lifetime of demanding equipment pad weathering, direct UV exposure, and intense seasonal temperature shifts, its rugged composite matrix completely resists material deformation, stress-cracking, and chemical bleaching from direct contact with highly concentrated sanitizers like chlorine, bromine, and winterizing acid flushes. Due to its thick-rimmed, solid plastic cylindrical geometry, this individual upper tank fitting carries a net product and shipping weight of approximately \u003cb data-path-to-node=\"2\" data-index-in-node=\"506\"\u003e0.80 pounds\u003c\/b\u003e (about 12.8 ounces).\u003c\/p\u003e","brand":"Commercial Pool and Spa Supplies","offers":[{"title":"Default Title","offer_id":53416216395887,"sku":"24900-0501Z","price":31.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0678\/3785\/3807\/files\/249000501__45723_95858cb7-748f-40bb-bbf8-00ae001c6f56.jpg?v=1782745579","url":"https:\/\/commercialpoolandspasupplies.com\/products\/pentair-21-and-25-upper-tank-fitting","provider":"Commercial Pool and Spa Supplies ","version":"1.0","type":"link"}