{"product_id":"aladdin-o-421","title":"Aladdin O-421-0 Diffuser O-Ring – Pentair 355331 \/ Challenger","description":"\u003ch2\u003eExact Diffuser O-Ring for Pentair Challenger and 355331 Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eAladdin O-421-0 replacement diffuser O-ring cross-referenced to Pentair part 355331.\u003c\/li\u003e\n\u003cli\u003eAladdin lists O-421-0 for PacFab\/Pentair Challenger applications and also cross-references Jacuzzi 47-0233-04-R.\u003c\/li\u003e\n\u003cli\u003ePentair’s Challenger parts documentation identifies 355331 specifically as the diffuser O-ring.\u003c\/li\u003e\n\u003cli\u003eO-421 is also included by Aladdin in service kits for later SuperFlo VS\/VST and SuperMax pump configurations that use the same diffuser seal.\u003c\/li\u003e\n\u003cli\u003eAftermarket Aladdin replacement part; not a Pentair OEM-branded O-ring.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuick Product Summary\u003c\/h2\u003e\u003cp\u003eThe Aladdin O-421-0 is a replacement diffuser O-ring used where the pump parts documentation calls for Pentair 355331. Aladdin directly lists O-421-0 for PacFab\/Pentair Challenger applications and cross-references Jacuzzi 47-0233-04-R. Pentair’s own Challenger replacement-parts documentation identifies 355331 as the diffuser O-ring used in the pump assembly.\u003c\/p\u003e\u003cp\u003eThis seal sits at the diffuser interface inside the pump and should be matched by exact pump model and replacement part number. A diffuser O-ring can be exposed during motor, impeller, diffuser, shaft-seal, or internal pump service, making it a practical seal to inspect whenever the wet end is already disassembled.\u003c\/p\u003e\u003cp\u003eAladdin also includes O-421 in its newer GO-KIT91V SuperFlo VS\/VST and SuperMax repair kit, while Pentair parts documentation uses 355331 as the diffuser seal on later SuperFlo VS configurations. Because earlier SuperFlo configurations can use a different diffuser seal, do not assume O-421-0 fits every SuperFlo-family pump without checking the exact model and parts diagram.\u003c\/p\u003e\u003ch2\u003eBest For\u003c\/h2\u003e\u003cp\u003eReplacing a worn, flattened, cut, or missing diffuser O-ring on a compatible Pentair Challenger pump or another verified pump configuration whose parts documentation specifies Pentair 355331.\u003c\/p\u003e\u003ch2\u003eWhy Exact Diffuser-Seal Matching Matters\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDirect aftermarket cross-reference for Pentair 355331.\u003c\/li\u003e\n\u003cli\u003eVerified by Aladdin for PacFab\/Pentair Challenger applications.\u003c\/li\u003e\n\u003cli\u003eUsed in Aladdin repair kits that service compatible Challenger and newer SuperFlo VS\/VST \/ SuperMax configurations.\u003c\/li\u003e\n\u003cli\u003eHelps avoid substituting a visually similar O-ring that may not match the required diffuser seal.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAladdin Equipment Company\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAladdin Part Number\u003c\/td\u003e\n\u003ctd\u003eO-421-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC \/ Barcode\u003c\/td\u003e\n\u003ctd\u003e601402122026\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003ePump diffuser O-ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Verified Application\u003c\/td\u003e\n\u003ctd\u003ePacFab \/ Pentair Challenger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePentair Cross-Reference\u003c\/td\u003e\n\u003ctd\u003e355331\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJacuzzi Cross-Reference\u003c\/td\u003e\n\u003ctd\u003e47-0233-04-R\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdditional Verified Use\u003c\/td\u003e\n\u003ctd\u003eUsed in select later SuperFlo VS\/VST and SuperMax service configurations that specify 355331 \/ O-421\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM Status\u003c\/td\u003e\n\u003ctd\u003eAftermarket Aladdin replacement part\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eCompatibility \/ Fitment Notes\u003c\/h2\u003e\u003cp\u003eAladdin lists O-421-0 for H4 \/ PacFab Challenger applications and cross-references Pentair 355331. Pentair’s Challenger parts sheet identifies 355331 as the diffuser O-ring.\u003c\/p\u003e\u003cp\u003eO-421 is also present in Aladdin’s GO-KIT91V for newer SuperFlo VS\/VST and SuperMax pumps. Earlier SuperFlo configurations may use a different diffuser seal, so verify the exact pump model and parts diagram before ordering.\u003c\/p\u003e\u003ch2\u003eInstallation \/ Use Notes\u003c\/h2\u003e\u003cp\u003eDisconnect electrical power to the pump and relieve system pressure before service. Open the pump according to the manufacturer’s service procedure, remove the diffuser as required, inspect the diffuser seal groove and mating surfaces, and replace the O-ring if it is damaged, flattened, stretched, or no longer seats correctly.\u003c\/p\u003e\u003cp\u003eReassemble the diffuser and pump carefully without pinching or displacing the seal. Follow the pump manufacturer’s instructions for the exact model and confirm the pump operates without leakage after service.\u003c\/p\u003e\u003ch2\u003eBuy with Confidence\u003c\/h2\u003e\u003cp\u003eBenchmark Pool Supply helps customers match pump O-rings by exact pump family and manufacturer cross-reference. O-421-0 is tied directly to Pentair 355331, so checking the pump parts diagram before ordering helps prevent confusion with other diffuser seals used across the SuperFlo and Challenger families.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eWhat is Aladdin O-421-0 used for?\u003c\/h3\u003e\u003cp\u003eO-421-0 is a pump diffuser O-ring. Aladdin lists it for PacFab\/Pentair Challenger applications and cross-references Pentair 355331.\u003c\/p\u003e\u003ch3\u003eWhat Pentair part does O-421-0 replace?\u003c\/h3\u003e\u003cp\u003eAladdin cross-references O-421-0 to Pentair 355331, which Pentair identifies as a diffuser O-ring or diffuser seal depending on the pump parts document.\u003c\/p\u003e\u003ch3\u003eDoes O-421-0 fit Pentair Challenger pumps?\u003c\/h3\u003e\u003cp\u003eYes. Aladdin specifically lists O-421-0 for PacFab\/Pentair Challenger applications.\u003c\/p\u003e\u003ch3\u003eDoes O-421-0 fit SuperFlo VS or SuperMax pumps?\u003c\/h3\u003e\u003cp\u003eIt is used in select later configurations that specify Pentair 355331; Aladdin includes O-421 in its GO-KIT91V SuperFlo VS\/VST and SuperMax repair kit. Verify the exact pump model before ordering.\u003c\/p\u003e\u003ch3\u003eIs O-421-0 a genuine Pentair OEM part?\u003c\/h3\u003e\u003cp\u003eNo. O-421-0 is an Aladdin aftermarket replacement that cross-references Pentair 355331.\u003c\/p\u003e","brand":"Aladdin Equipment Company Inc","offers":[{"title":"Default Title","offer_id":43101085073482,"sku":"O-421-0","price":6.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0637\/6580\/7178\/files\/O-421-0__67922_54d35864-39cf-4284-9502-dc0572a3f304.webp?v=1787672028","url":"https:\/\/benchmarkpoolsupply.com\/products\/aladdin-o-421","provider":"Benchmark Pool Supply","version":"1.0","type":"link"}