Hayward CX250G Star-Clear filter lock knobHayward Star-Clear Filter Lock Knob, CX250G In stock$3499
Hayward CX250G Star-Clear filter lock knob
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Hayward Star-Clear Filter Lock Knob, CX250G

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$3499
In stock
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Quick overview

  • Genuine Hayward Factory part CX250G for the Star-Clear filter line.
  • Star-Clear coverage Listed for the C-250, C-500, C-750 and C-1000 cartridge filters.
  • Holds the head down The knob is what draws the filter head onto the tank and keeps the seal loaded.
  • Direct replacement Fits the existing tie rod, no other parts needed.
  • Common failure point Threads strip and the plastic goes brittle after years of sun and handling.
  • Cheap fix for a leaking head A knob that will not tighten is often mistaken for a failed tank o-ring.
Full description and specifications ↓

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Product details

The Hayward CX250G is the lock knob for Star-Clear cartridge filters, covering the C-250, C-500, C-750 and C-1000 models.

What it does

The knob threads onto the tie rod and pulls the filter head down onto the tank. That clamping load is what keeps the tank o-ring compressed and the filter sealed under running pressure. It also gets turned by hand every time the cartridge is cleaned.

Why it fails

Between the sun, the chlorine and the hand tightening season after season, the plastic goes brittle and the threads round off. Once the knob will not pull the head down properly the filter weeps at the band, and owners usually replace the tank o-ring first and are surprised when the leak stays. If the knob spins without drawing down, that is your answer. The tie rod itself is a separate part if that has also gone.

Specifications
Brand Hayward
Manufacturer part number CX250G
UPC 610377004558
Type Pool Filter Part
Component Filter lock knob
Fits Hayward Star-Clear cartridge filters C-250, C-500, C-750, C-1000
Shipping weight 0.25 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

Which filters does it fit?
Hayward Star-Clear cartridge filters, models C-250, C-500, C-750 and C-1000.
Is it genuine Hayward?
Yes, part number CX250G.
Does the tie rod come with it?
No, this is the lock knob alone. The tie rod is a separate Hayward part.
My filter head is leaking, is the knob the cause?
It can be. If the knob will not pull down tight because the threads have stripped or the plastic has cracked, the head never fully seats and the tank seal leaks. Check the knob before condemning the o-ring.
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