Product Details
- Product type: Replacement plug
- Brand: Zodiac
- Part number: R0511800
- Compatible system type: Select Zodiac AquaPure Ei Series electronic salt water chlorine generators
- Known compatible models: APURE35 and APURE35PLG
- Use: Helps replace the plug used on compatible AquaPure Ei generator assemblies
- Package contents: Verify before publishing, especially whether O-rings are included
- Best use case: Replacing a damaged, worn, or missing plug on a compatible AquaPure Ei system
Compatibility and Buyer Check
Before ordering, confirm that your system is part of the Zodiac AquaPure Ei Series and that your manual calls for part number R0511800. This plug is listed for select AquaPure Ei electronic salt water chlorine generator models, including APURE35 and APURE35PLG.
Do not order by image alone. Similar Zodiac and Jandy parts may look close but can have different fitment, threads, or sealing requirements.
If the locking ring is damaged or difficult to secure, review the Zodiac R0511300 locking ring replacement before replacing the plug. If the electrode assembly is the issue, compare this part with the Zodiac R0511400 35 electrode replacement.
What This Replacement Plug Does
The plug helps close and seal the proper area of the compatible AquaPure Ei salt chlorine generator assembly. A damaged or missing plug may lead to leaks, poor fitment, or service issues around the generator body.
Replacing the plug can help restore the proper closure point when the rest of the system is still in good working condition. It will not fix electrical faults, low chlorine output, worn electrodes, or control board problems.
Before You Order
Check these details before purchasing:
- Confirm the part number R0511800.
- Verify your system model is APURE35, APURE35PLG, or another compatible AquaPure Ei model.
- Compare the thread style and shape with your original plug.
- Check whether your current O-ring or seal also needs replacement.
- Inspect the surrounding housing, ring, and electrode area for cracks or wear.
- If the housing area is damaged, check the Zodiac R0512000 pod housing replacement.
- If your issue is related to the circuit board or control operation, review the Zodiac R0512300 TS control PCB assembly instead.
For small hardware around the same AquaPure Ei system, the Zodiac R0512900 screw replacement set may also be useful when servicing the assembly.
Installation Notes
Turn off power to the salt water chlorine generator and pool equipment before removing or replacing the plug. Relieve pressure from the system before opening any part of the generator assembly.
Install the replacement plug by matching the original position and thread direction. Do not cross-thread or overtighten the plug. If an O-ring is used, make sure it is seated correctly and not pinched, dry, cracked, or flattened.
After installation, restart the system and check carefully for leaks before leaving the equipment running unattended.
Maintenance Tips
To help prevent future plug and seal problems:
- Inspect the plug during routine salt cell maintenance.
- Keep the plug threads clean and free from debris.
- Replace worn or flattened seals as needed.
- Avoid using tools that can damage the plastic plug head.
- Do not force the plug if it does not thread smoothly.
- Check the generator body for cracks before assuming the plug is the only issue.

















