Product Details
- Product type: Main O-ring electrode housing replacement
- Part number: R0511600
- Brand: Zodiac
- Compatible system type: Select Zodiac AquaPure Ei Series electronic salt water chlorine generators
- Compatible models to verify: APURE35 and APURE35PLG / APURE35PLC, based on your system label or manual
- Use: Helps seal the electrode housing connection
- Best for: Replacing a worn, stretched, brittle, or leaking main O-ring
- Package includes: Verify whether this listing includes one O-ring only
- Installation note: Power off the system and relieve pressure before service
Compatibility and Fitment Notes
This O-ring should be selected by part number and system compatibility, not by appearance alone. Many pool chlorinator O-rings look similar, but small differences in diameter, thickness, or material can affect sealing.
If the electrode is worn or no longer producing chlorine correctly, review the Zodiac R0511400 35 electrode replacement as a related repair part. If the housing itself is cracked, warped, or damaged, check the Zodiac R0512000 pod housing replacement instead of replacing only the O-ring.
When to Replace This O-Ring
Replace the main O-ring if you see water leaking around the electrode housing, if the old ring has become flat or brittle, or if it no longer sits securely in the groove. A worn O-ring can allow water to escape from the housing connection and may also make the system harder to reassemble correctly after maintenance.
This part is especially useful when servicing the electrode housing, cleaning the salt cell area, or replacing nearby AquaPure Ei components.
Installation and Handling Tips
Turn off the chlorine generator, shut down the pump, and release system pressure before opening the housing. Remove the old O-ring carefully, then clean the groove and sealing surface before installing the replacement. Dirt, salt scale, or leftover debris can prevent the new O-ring from sealing properly.
Seat the new O-ring evenly without twisting or stretching it. For service work around the AquaPure Ei housing, the Zodiac R0512600 locking ring tool replacement may help remove and secure the locking ring properly.
Troubleshooting Before Ordering
Before replacing the O-ring, confirm the leak is coming from the electrode housing area. If water is coming from a plug, adapter, union, or cracked plastic part, a different replacement may be needed.
For plug-related fitment or sealing issues in the same AquaPure Ei system, compare the Zodiac R0511800 plug replacement before ordering. If the system has power or board-related faults rather than a leak at the housing, the Zodiac R0512100 power PCB assembly replacement may be the more relevant part.











