Hayward
Hayward CX800G Star-Clear II Locking Knob
Hayward CX800G Star-Clear II Locking Knob
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Hayward CX800G Star-Clear II Locking Knob
The Hayward CX800G locking knob was used on select Hayward Star-Clear II cartridge filter systems to help secure the filter head or dome to the tank body. This part is now discontinued, so availability is limited to remaining inventory only.
What This Part Is Used For
The CX800G locking knob is a replacement fastening component used on compatible Hayward Star-Clear II cartridge filter systems. Its job is to help tighten and secure the filter head assembly during normal pool filtration operation.
A worn, cracked, stripped, or missing knob can prevent the filter from closing correctly and may lead to poor sealing, leaks, or unsafe operation under pressure.
Why Fitment Matters
Older Hayward cartridge filters often have model-specific lid, dome, clamp, and knob hardware. Because this part is discontinued, it is especially important to confirm the exact filter model and original part number before purchasing.
Do not assume this knob fits all Hayward cartridge filters. It is intended for compatible Star-Clear II applications only.
Key Features and Specifications
| Specification | Details |
|---|---|
| Manufacturer | Hayward |
| Manufacturer Part Number | CX800G |
| Part Type | Filter locking knob |
| Compatible Product Family | Select Hayward Star-Clear II cartridge filter systems |
| Function | Helps secure the filter head or dome to the tank body |
| Status | Discontinued |
Overview
The Hayward CX800G Star-Clear II locking knob is a replacement knob used on compatible Hayward Star-Clear II cartridge filter assemblies. This knob helps secure the upper portion of the filter housing so the filter can seal properly during operation.
Since this part is discontinued, it is most commonly purchased for repair of older filter systems where the original knob is damaged, missing, cracked, or no longer tightening correctly.
Compatibility
This part is intended for compatible Hayward Star-Clear II filter systems that originally used Hayward part number CX800G.
Installation Guidance
- Turn the pool pump off before servicing the filter.
- Relieve all filter pressure before loosening any lid, dome, clamp, or knob hardware.
- Remove the old knob and inspect the related filter head, clamp, threads, and sealing surfaces.
- Install the replacement knob only if the surrounding filter hardware is in safe working condition.
- Tighten evenly and do not over-torque the knob.
- Restart the system and inspect carefully for leaks.
Always follow the safety instructions in your filter manual. Pool filters operate under pressure, and damaged closure hardware should be addressed before the system is placed back into service.
Discontinued Item Notes
Hayward CX800G is discontinued. That means future availability may be limited, inconsistent, or unavailable once remaining inventory is sold.
If your filter requires multiple discontinued closure components, or if the tank, lid, clamp, or pressure hardware is damaged, replacing the complete filter may be the safer long-term repair path.
Common Service Context
Customers typically look for the CX800G locking knob when their original knob is cracked, stripped, difficult to tighten, missing, or no longer holding the filter head securely. On older filters, this can also be a sign that other closure components should be inspected.
If the filter is leaking after replacement, check the O-ring, lid condition, tank flange, clamp alignment, and overall filter body condition before assuming the new knob is the issue.
Shipping and Returns
This replacement part ships as an individual service component. Please confirm fitment before ordering, especially because this is a discontinued item.
Electrical, gas, pressure vessel, pool filter, and special-order replacement parts may be subject to return restrictions once installed, used, or removed from original packaging.
Before You Order
Confirm your filter model, compare the existing knob to part number CX800G, and inspect the rest of the filter closure hardware. If the filter body, lid, clamp, or sealing surface is damaged, replacing only the knob may not solve the problem.
Aqua Terra Backyard recommends replacing discontinued pressure-related filter parts only when the rest of the filter assembly is still in safe, serviceable condition.
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