{"product_id":"pentairwaterpoolandspainc_39300600z","title":"Pentair Buna-N Cover O-Ring | Ultra-Flow Strainer | 39300600Z","description":"\u003cp\u003eThe Pentair 39300600Z is the OEM replacement Buna-N cover O-ring for the Ultra-Flow strainer, for units manufactured after November 1994.\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: VERSION DATE — CONFIRM BEFORE ORDERING\u003c\/strong\u003e\u003cbr\u003eThis O-ring is specified for Ultra-Flow strainer units manufactured after November 1994. Verify your unit's manufacture date before ordering to ensure correct fitment.\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: LUBRICATION REQUIRED — SOLD SEPARATELY\u003c\/strong\u003e\u003cbr\u003eAlways lubricate this O-ring with a silicone-based lubricant before installation. We carry the \u003ca href=\"https:\/\/poolaroo.com\/products\/pentairwaterpoolandspainc_r172351\" alt=\"Pentair R172351 Lifeguard Silicone Lubricant\"\u003ePentair R172351 Lifeguard Silicone Lubricant\u003c\/a\u003e — the OEM-matched product for Pentair equipment.\u003c\/p\u003e\n\n\u003cp\u003eThis cover O-ring seals the strainer lid to the strainer housing on the Ultra-Flow pump, preventing air from entering the suction side of the system. A degraded or flattened O-ring allows air ingestion, which reduces prime and can cause the pump to lose flow. Match the part number on your existing O-ring before ordering.\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;\"\u003e39300600Z\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eBuna-N (NBR)\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\u003eFits\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eUltra-Flow Strainer (after November 1994)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\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\/table\u003e\n\n\u003ch3\u003ePro Tip\u003c\/h3\u003e\n\u003cp\u003eInspect this O-ring every season and replace it if it shows any flattening, cracking, or tackiness — a failed cover O-ring is a common cause of air bubbles in the return lines. Before installation, apply a thin coat of \u003ca href=\"https:\/\/poolaroo.com\/products\/pentairwaterpoolandspainc_r172351\" alt=\"Pentair R172351 Lifeguard Silicone Lubricant\"\u003ePentair R172351 Lifeguard Silicone Lubricant\u003c\/a\u003e to help the O-ring seat evenly and extend its service life. Never use petroleum-based lubricants — they will degrade Buna-N rubber.\u003c\/p\u003e\n\n\u003c!-- wft:processed:manual:2026-04-16 --\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":53932871319827,"sku":"39300600Z","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/pentair-buna-n-cover-o-ring-ultra-flow-strainer-39300600z.webp?v=1780913440","url":"https:\/\/poolaroo.com\/products\/pentairwaterpoolandspainc_39300600z","provider":"Poolaroo","version":"1.0","type":"link"}