1. Introduction
This manual provides essential instructions for the proper installation and maintenance of your eMagTech P6664ASS16 P6664 Rubber O-Ring Seals. These O-rings are designed as replacement parts for various Bestway pool systems, ensuring a secure and leak-free connection. Please read this manual thoroughly before proceeding with installation.
2. Product Overview
The eMagTech P6664ASS16 P6664 Rubber O-Ring Seals are high-quality nitrile rubber components engineered for durability and effective sealing. Each package contains 10 O-rings, providing multiple replacements for your pool equipment.

Image 2.1: A set of ten eMagTech P6664ASS16 P6664 rubber O-ring seals.
Key features include:
- Direct replacement for OEM Part Numbers P6664ASS16 and P6664.
- Constructed from durable nitrile rubber for reliable sealing.
- Designed for compatibility with specific Bestway pool and filter systems.
- Package contains 10 O-rings for multiple replacements.
3. Compatibility
These O-ring seals are compatible with the following Bestway models and systems:
- Bestway Flowclear Sand Filter Systems: 58515, 58397, 58634
- Bestway Power Steel Frame Pools: 56442, 56457, 56671, 56946
- Bestway Hydrium Pools: 56566, 56574, 56586
4. Specifications
| Attribute | Value |
|---|---|
| Replacement Part Numbers | P6664ASS16, P6664 |
| Outside Diameter (OD) | 75mm |
| Inside Diameter (ID) | 71mm |
| Width | 2mm |
| Material | Nitrile Rubber |
| Color | Black |
| Quantity per Package | 10 pieces |

Image 4.1: Dimensional view of the O-ring seal.
5. Installation and Replacement
Follow these steps to replace an existing O-ring seal in your Bestway pool or filter system. Always ensure the system is powered off and depressurized before beginning any maintenance.
- Safety First: Disconnect power to the pump and filter system. Close any valves to prevent water flow.
- Drain Water: If applicable, drain water from the relevant section of the pool or filter system to prevent spills.
- Locate the Old O-Ring: Identify the connection point where the O-ring needs replacement. This is typically where hoses connect to the filter pump or sand filter.
- Remove Old O-Ring: Carefully remove the old, worn, or damaged O-ring. Use a small, blunt tool if necessary, taking care not to scratch or damage the O-ring groove.
- Clean the Groove: Clean the O-ring groove and mating surfaces thoroughly. Remove any debris, dirt, or old lubricant. A clean surface is crucial for a proper seal.
- Lubricate New O-Ring: Apply a thin, even coat of silicone-based lubricant (pool-safe) to the new eMagTech O-ring. This helps with installation and improves the seal's longevity.
- Install New O-Ring: Carefully place the new, lubricated O-ring into the clean groove. Ensure it sits flat and is not twisted or pinched.

Image 5.1: O-rings positioned near a filter system connection, illustrating their intended use.
- Reconnect Components: Reassemble the components, ensuring they are properly aligned. Hand-tighten any connections first, then use appropriate tools if required, being careful not to overtighten. Overtightening can damage the O-ring or the connection.
- Test for Leaks: Restore power and water flow to the system. Carefully inspect the newly sealed connection for any signs of leaks. If a leak is detected, immediately shut down the system and re-evaluate the installation.
6. Maintenance
While O-rings are replacement parts, proper handling and periodic inspection can extend their effective life and prevent premature failure:
- Regular Inspection: Periodically check O-rings for signs of wear, cracking, flattening, or stretching, especially during seasonal pool opening and closing.
- Proper Lubrication: When reinstalling or replacing O-rings, always use a silicone-based lubricant specifically designed for pool equipment. Avoid petroleum-based lubricants, as they can degrade rubber.
- Storage: Store spare O-rings in a cool, dry place away from direct sunlight and harsh chemicals to maintain their material integrity.
7. Troubleshooting
If you experience issues after replacing an O-ring, consider the following:
- Leakage at Connection:
- Ensure the O-ring is correctly seated in its groove and not twisted.
- Verify that the O-ring groove and mating surfaces are clean and free of debris.
- Check if the O-ring is damaged (cut, pinched, or stretched) during installation.
- Confirm that the connection is tightened sufficiently, but not overtightened.
- Difficulty Installing:
- Ensure the O-ring is adequately lubricated with a silicone-based lubricant.
- Verify you are using the correct size O-ring for the specific connection. Refer to the specifications section.