Aladdin O-Ring for Sta-rite 21" System:3 Tank O-485
Aladdin
SKU: O-485
Aladdin O-485 Sta-Rite System:3 21" Filter Tank O-Ring | Pentair 24850-0008
The Aladdin O-485 Replacement Tank O-Ring is designed for select Pentair and Sta-Rite System:3 swimming pool filters with 21-inch tank assemblies. This replacement gasket provides a watertight seal between the filter tank sections, helping prevent water leaks and maintain proper filtration system operation.
Manufactured by Aladdin Equipment Company, the O-485 is a direct aftermarket replacement for Pentair/Sta-Rite 24850-0008. It is commonly used in System:3 modular cartridge, D.E., and sand filter applications requiring the 21-inch tank sealing gasket.
Product Features
- 21-Inch Tank O-Ring: Designed for compatible Pentair/Sta-Rite System:3 filter tanks.
- OEM Replacement: Replaces Pentair/Sta-Rite part number 24850-0008.
- Watertight Seal: Helps prevent water leakage between filter tank sections.
- Durable Construction: Manufactured for swimming pool filtration equipment applications.
- Multiple Filter Applications: Fits select System:3 modular cartridge, D.E., and sand filters.
- Aftermarket Replacement: Manufactured by Aladdin as an alternative to the original Pentair gasket.
Product Specifications
- Manufacturer: Aladdin Equipment Company
- Manufacturer Part Number: O-485 / O-485-0
- Product Type: Pool Filter Tank O-Ring
- Inside Diameter: Approximately 21 Inches
- Cross-Section: Approximately 1/2 Inch
- Application: System:3 Filter Tank Seal
- OEM Cross Reference: Pentair 24850-0008
- Compatible Manufacturer: Pentair / Sta-Rite
- UPC: 601402193545
- Quantity: 1 O-Ring
Compatible Pentair / Sta-Rite Filters
- Sta-Rite System:3 S7M120 Modular Media Filter
- Sta-Rite System:3 S7D75 D.E. Filter
- Sta-Rite System:3 S7S50 Sand Filter
- Other compatible 21-inch System:3 tank assemblies requiring Pentair 24850-0008
Compatibility: This O-ring is intended for 21-inch System:3 tank assemblies. Verify the filter model and original tank O-ring part number before ordering.
Signs Your Filter Tank O-Ring Needs Replacement
Filter tank O-rings can deteriorate with age, chemical exposure, and repeated filter servicing. Common signs of a damaged tank seal include:
- Water leaking between the upper and lower filter tank sections
- Cracked, flattened, or hardened O-ring material
- Visible cuts, tears, or stretching
- Leaks after cleaning or reassembling the filter
- Improper seating of the original tank gasket
Installation and Maintenance
- Turn off the pool pump and disconnect electrical power.
- Completely relieve all internal filter pressure according to the manufacturer's instructions.
- Confirm the pressure gauge reads zero before opening the filter.
- Disassemble the filter tank following the Pentair/Sta-Rite service instructions.
- Remove the original tank O-ring and thoroughly clean the sealing groove.
- Inspect the tank sealing surfaces for cracks, debris, or damage.
- Install the new Aladdin O-485 O-ring, ensuring it is seated evenly without twisting.
- Apply a thin layer of manufacturer-approved silicone lubricant if recommended.
- Reassemble the filter and secure the tank closure according to the manufacturer's instructions.
- Restart the system following the manufacturer's safety procedures and inspect for leaks.
Related Filter Tank O-Rings and Maintenance Products
Aqua Pool Supply carries additional replacement filter tank O-rings and maintenance products for Pentair and Sta-Rite swimming pool filters.
- Aladdin O-486 – Sta-Rite System:3 25" Tank O-Ring – Replacement tank gasket for compatible larger 25-inch System:3 filter assemblies. This is a different size and is not interchangeable with the O-485.
- Aladdin Magic Lube – Pool & Spa O-Ring Lubricants – Silicone-based lubricant options for compatible pool and spa seals. Follow filter manufacturer lubrication recommendations.
Additional Pentair and Sta-Rite Replacement Parts
Browse our Pentair/Sta-Rite System:3 replacement parts for additional filter components, gaskets, and maintenance supplies.
Package Includes: One (1) Aladdin O-485 replacement 21-inch filter tank O-ring.
Important: The O-485 is an aftermarket replacement manufactured by Aladdin Equipment Company. It is not manufactured by Pentair. This listing includes the tank O-ring only; other filter seals, clamp hardware, and replacement components are sold separately.
Safety: Swimming pool filters operate under pressure. Never loosen or remove filter tank closures while the system is pressurized. Always follow the filter manufacturer's service and reassembly instructions.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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