Compatible with Aladdin
O-390-9
Shaft O-Ring for HR-21, HR-25 and HR-31 Sand Filters
Our part number
If the number stamped on your failed part differs, send it over — we will confirm the match against our fitment records.
OEM numbers listed for fitment identification only.
Specifications
| Compatible brand | Aladdin |
|---|---|
| Category | Filters & Filter Parts |
| Material | EPDM rubber |
| Lead time | 15–25 days after order confirmation |
- MOQ 50 pcs · samples from 1
- Private label available
- Ships from our factory
Request wholesale quote
One request covers the whole list — no need to send them one by one.
Tiered pricing available above 1,000 pcs · OEM packaging available
Product overview
The Shaft O-Ring for HR-21, HR-25 and HR-31 Sand Filters is an aftermarket o-ring built to replace the original component in Aladdin filtration systems. In service it forms the static seal between two mating components under compression. This is a consumable in practice: rubber hardens, flattens and cracks with heat, chlorine and UV exposure, and a failed o-ring is the most common source of air leaks and drips. Ours is molded in EPDM rubber.
Fits these systems
Pentair Purex Tahitian Fiberglass Sand Filter Model HR-21, 25 & 31 Parts
Not sure it fits? Send us a photo of your part and we'll confirm. Send a photo
Often sourced together
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O-Ring, 2-Inch, Compatible with Hayward Super Star Clear Filter
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Sourcing questions
What equipment does O-390-9 fit?
It fits HR-21, HR-25, HR-31 and Tahitian. Those are equipment models, not part numbers — order against O-390-9 itself.
Is O-390-9 a genuine Aladdin part?
No. POOLPOINT manufactures compatible aftermarket replacement parts. We are not affiliated with, sponsored by or endorsed by Aladdin; the brand name and OEM numbers are used to identify fitment only.
What is the minimum order quantity for O-390-9?
MOQ is 50 pcs per part, and mixed cartons are welcome to reach the order minimum. Samples are a separate case — we supply single pieces so you can confirm fitment before committing to a production run.
What material is O-390-9 made from?
O-390-9 is produced in EPDM rubber, dimensionally checked against an OEM sample before tooling is signed off.
O-390-9
Shaft O-Ring for HR-21, HR-25 and HR-31 Sand Filters