Hayward Star-Clear Locking Knob | CX250G
Hayward Products
SKU: CX250G
Hayward CX250G Star-Clear™ Filter Locking Knob (Replacement)
The Hayward CX250G is a genuine OEM locking knob used on Hayward Star-Clear cartridge filters. This knob secures the filter head to the filter body, helping maintain a tight seal for proper filtration. Replace it if the original knob is cracked, stripped, missing, or no longer tightens smoothly.
Fits / Compatibility
- Hayward Star-Clear cartridge filter models: C250, C500, C750, C100
What It Fixes
- Filter lid/head won’t tighten or stay secured
- Cracked, sun-brittle, or stripped locking knob
- Seepage at the head/body area caused by an improperly secured head (after confirming O-rings are in good condition)
Key Details
- Part Number: CX250G
- Part Type: Filter Parts
- GTIN/UPC: 610377004558
- Replacement Part Warranty (typical): 6 months (parts only)
Installation Notes
- Turn off the pump and relieve pressure before opening the filter.
- Install the new locking knob and tighten per the filter’s instructions—do not overtighten.
- If you still have leaks after replacement, inspect the filter head O-ring/sealing surfaces and replace worn seals as needed.
Related Products
- Hayward CX250G Locking Knob (search)
- Hayward Star-Clear Filter Parts (search)
- Hayward C250 Filter Parts (search)
- Hayward C500 Filter Parts (search)
- Star-Clear Lid/Head O-Rings (search)
- Silicone O-Ring & Gasket Lubricant (search)
Maintenance Tips
- Keep the filter head O-ring clean and lightly lubricated with silicone-based lube to improve sealing and reduce binding.
- Do not use tools to over-tighten plastic knobs—snug and evenly seated is best.
- If the knob becomes hard to turn, clean debris from threads/seating surfaces before forcing it.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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