{"product_id":"pentairrainbow128bottomoringr172319penr172319z","title":"Pentair Rainbow #128 Bottom O-Ring | R172319","description":"\u003cdiv\u003e\n  \u003ch2\u003ePentair Rainbow Bottom O-Ring #128 (Diverter Tee Seal) | R172319\u003c\/h2\u003e\n\n  \u003cp\u003e\n    The Pentair Rainbow R172319 is the \u003cstrong\u003ebottom O-ring (#128)\u003c\/strong\u003e used to seal the internal diverter tee\/sleeve\n    connection in select Pentair Rainbow in-line chemical feeders. Replacing this O-ring helps stop internal bypass and small\n    leaks that can cause inconsistent chlorine\/bromine output, air intrusion, or water seepage around the feeder body.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Pentair Rainbow in-line automatic feeders \u003cstrong\u003eModel 320\u003c\/strong\u003e and \u003cstrong\u003eModel 322\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUsed at:\u003c\/strong\u003e Diverter tee to sleeve \/ internal bottom seal location (as specified on the feeder parts diagram)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAlso seen as:\u003c\/strong\u003e R172319Z (revision\/replacement part number in some listings)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eWhat This O-Ring Does\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eCreates a watertight seal at the diverter tee\/sleeve connection inside the feeder\u003c\/li\u003e\n    \u003cli\u003eHelps maintain consistent sanitizer feed by preventing internal leakage or bypass\u003c\/li\u003e\n    \u003cli\u003eReduces the chance of air being pulled into the system from a compromised internal seal\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eCommon Signs It Needs Replacement\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eFeeder output becomes inconsistent even after adjusting the control dial\u003c\/li\u003e\n    \u003cli\u003eWater seepage around the feeder body after opening\/servicing the unit\u003c\/li\u003e\n    \u003cli\u003eO-ring is flattened, swollen, brittle, cracked, or nicked\u003c\/li\u003e\n    \u003cli\u003eDifficulty resealing the feeder properly after tablet refills\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eSpecifications\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Pentair \/ Rainbow\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e R172319\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eO-Ring Reference:\u003c\/strong\u003e #128\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Bottom O-ring \/ diverter tee seal\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e Sold individually\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eShut off the pump and relieve system pressure before opening the feeder.\u003c\/li\u003e\n    \u003cli\u003eRemove tablets and drain\/flush the feeder as needed for safe handling.\u003c\/li\u003e\n    \u003cli\u003eDisassemble to access the diverter tee\/sleeve area; remove the old O-ring and clean the groove thoroughly.\u003c\/li\u003e\n    \u003cli\u003eLightly lubricate the new O-ring with silicone lubricant (never petroleum-based) and seat it evenly without twisting.\u003c\/li\u003e\n    \u003cli\u003eReassemble, restart the system, and inspect for leaks and normal feeder operation.\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\/pages\/search-results-page?q=R172009\"\u003eRainbow 300\/320\/322 Lid O-Ring (R172009)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=R172036Z\"\u003eSilicone Lubricant for O-rings and seals (R172036Z)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=Rainbow%20320%20parts\"\u003ePentair Rainbow Model 320 parts\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=Rainbow%20322%20parts\"\u003ePentair Rainbow Model 322 parts\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=chlorinator%201%2F2%20tube\"\u003e1\/2\" feeder tubing, nuts, and fittings\u003c\/a\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eMaintenance Tips\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eKeep feeder O-rings clean and lightly lubricated to prevent pinching during reassembly.\u003c\/li\u003e\n    \u003cli\u003eAvoid over-tightening lids and fittings; excessive force can deform sealing surfaces and shorten O-ring life.\u003c\/li\u003e\n    \u003cli\u003eMaintain balanced water chemistry—high pH and high calcium can increase scaling that stresses internal seals.\u003c\/li\u003e\n    \u003cli\u003eIf the feeder is exposed to freezing temperatures, winterize properly to reduce crack and seal damage.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n","brand":"Pentair","offers":[{"title":"Default Title","offer_id":52589955088700,"sku":"R172319Z","price":6.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/3280\/9276\/files\/pentair-rainbow-128-bottom-o-ring-r172319-chlorinator-parts-6705616.jpg?v=1770941187","url":"https:\/\/aquapoolsupply.com\/products\/pentairrainbow128bottomoringr172319penr172319z","provider":"Aqua Pool Supply","version":"1.0","type":"link"}