Product Details
- Product type: Union replacement O-rings with lube
- Brand: BadAss Pool Supply
- Part number/reference: 521147
- Quantity: Pack of 2 O-rings
- Color: Black
- Material type: Confirm current material details on the seller listing before purchase
- Compatible system type: Pentair IntelliChlor and iChlor IC Series salt chlorine generator unions
- Use: Helps seal compatible salt cell union connections
- Best use case: Replacing worn or leaking union O-rings during IntelliChlor or iChlor salt cell service
- Package contents: Pack of 2 O-rings with lube, unless otherwise stated by the seller
Compatibility and Buyer Check
Before ordering, confirm that your salt chlorine generator uses the 521147-style union O-ring and that it fits your IntelliChlor or iChlor IC Series union connection. Do not order by image alone, because O-rings can look similar but may differ in size, thickness, and fit.
If you are servicing the salt cell at the same time, compare your setup with the Pentair 520555 IntelliChlor IC40 salt chlorine generator cell or the Pentair 521105 IntelliChlor IC60 salt chlorine generator cell before replacing only the O-rings.
If your system needs a power center instead of small seal parts, review the IntelliChlor salt chlorine generator power center or the 520556 power center compatible with IntelliChlor systems.
What These O-Rings Do
These replacement O-rings help create a seal at compatible union connections on IntelliChlor and iChlor salt chlorine generator systems. A worn or dry O-ring may cause dripping, poor sealing, or difficulty tightening the union by hand.
Replacing the O-rings can help restore a proper seal when the unions, cell body, and plumbing connections are still in good condition. They will not fix cracked unions, damaged threads, a failed salt cell, low chlorine output, or control system errors.
Before You Order
Check these details before purchasing:
- Confirm the part number or replacement reference 521147.
- Verify that your system is a compatible Pentair IntelliChlor or iChlor IC Series model.
- Confirm that you need union O-rings, not a full union kit or cell replacement.
- Inspect the union threads, cell ports, and plumbing fittings for cracks or damage.
- Make sure the O-ring size matches your existing seal.
- If the salt cell needs cleaning, review the IntelliChlor acid washing kit replacement before reinstalling the cell.
- Check whether the included lubricant is suitable for pool equipment O-rings.
Installation Notes
Turn off the pool equipment before removing the salt cell or opening the union connections. Remove the old O-rings carefully and clean the sealing surface before installing the new set.
Apply only the recommended O-ring lubricant if needed. Do not use petroleum-based products unless the manufacturer confirms they are safe for this type of seal. Seat the O-rings evenly and tighten unions by hand without cross-threading or overtightening.
After installation, restart the system and check both union connections for leaks while the pump is running.
Maintenance Tips
To help prevent future union leaks:
- Inspect O-rings whenever the salt cell is removed for cleaning.
- Replace flattened, cracked, swollen, or brittle O-rings.
- Keep sealing surfaces clean before reinstalling the cell.
- Use only compatible O-ring lubricant.
- Do not overtighten unions to compensate for a damaged seal.
- Check for leaks after each salt cell cleaning or replacement.











