Exact Diffuser O-Ring for Pentair Challenger and 355331 Applications
- Aladdin O-421-0 replacement diffuser O-ring cross-referenced to Pentair part 355331.
- Aladdin lists O-421-0 for PacFab/Pentair Challenger applications and also cross-references Jacuzzi 47-0233-04-R.
- Pentair’s Challenger parts documentation identifies 355331 specifically as the diffuser O-ring.
- O-421 is also included by Aladdin in service kits for later SuperFlo VS/VST and SuperMax pump configurations that use the same diffuser seal.
- Aftermarket Aladdin replacement part; not a Pentair OEM-branded O-ring.
Quick Product Summary
The 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.
This 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.
Aladdin 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.
Best For
Replacing 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.
Why Exact Diffuser-Seal Matching Matters
- Direct aftermarket cross-reference for Pentair 355331.
- Verified by Aladdin for PacFab/Pentair Challenger applications.
- Used in Aladdin repair kits that service compatible Challenger and newer SuperFlo VS/VST / SuperMax configurations.
- Helps avoid substituting a visually similar O-ring that may not match the required diffuser seal.
Product Specifications
| Specification | Details |
|---|---|
| Brand | Aladdin Equipment Company |
| Aladdin Part Number | O-421-0 |
| UPC / Barcode | 601402122026 |
| Product Type | Pump diffuser O-ring |
| Primary Verified Application | PacFab / Pentair Challenger |
| Pentair Cross-Reference | 355331 |
| Jacuzzi Cross-Reference | 47-0233-04-R |
| Additional Verified Use | Used in select later SuperFlo VS/VST and SuperMax service configurations that specify 355331 / O-421 |
| OEM Status | Aftermarket Aladdin replacement part |
Compatibility / Fitment Notes
Aladdin 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.
O-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.
Installation / Use Notes
Disconnect 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.
Reassemble 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.
Buy with Confidence
Benchmark 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.
Frequently Asked Questions
What is Aladdin O-421-0 used for?
O-421-0 is a pump diffuser O-ring. Aladdin lists it for PacFab/Pentair Challenger applications and cross-references Pentair 355331.
What Pentair part does O-421-0 replace?
Aladdin 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.
Does O-421-0 fit Pentair Challenger pumps?
Yes. Aladdin specifically lists O-421-0 for PacFab/Pentair Challenger applications.
Does O-421-0 fit SuperFlo VS or SuperMax pumps?
It 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.
Is O-421-0 a genuine Pentair OEM part?
No. O-421-0 is an Aladdin aftermarket replacement that cross-references Pentair 355331.
