Pool Filter Knob Kit – CX900G & CX900DA Replacement Parts

Pool Filter Lock Knob Kit – CX900G & CX900DA Replacement Parts

Keep your swimming pool running crystal-clear with this complete Pool Filter Lock Knob Replacement Kit, purpose-built for Hayward Star-Clear Plus cartridge filters. Whether you need just the locking knob (CX900G) or the full hardware set (CX900DA), this kit delivers a secure, leak-free fit and hassle-free installation — no special tools required.

What's in the Box?

• 1 × CX900G Locking Knob – Weatherproof, UV-resistant construction for lasting outdoor use
• 1 × CX900DA Knob Kit, which includes:
  • 2 × CX900W Washers
  • 1 × CX900D Guide Cone
  • 1 × C900J E-Clip
  • 1 × CX900H O-Ring
  • 1 × CX900F Filter Head O-Ring
  • 1 × ECX1322A Directional Vent Valve with O-Ring

Key Features

• Broad Compatibility: Fits Hayward Star-Clear Plus cartridge filter models C751, C7512, C900, C9002(S), C1200, C12002(S), C1502, C17502(S), and C2002
• Waterproof & Sunproof: The CX900G knob is crafted from high-grade, weather-resistant material designed to withstand prolonged pool-side exposure
• Stops Leaks at the Source: The CX900DA kit seals the top of the filter housing, stopping drips and keeping your filtration system operating at peak efficiency
• Easy Filter Maintenance: The guide cone accurately aligns the filter top onto the threaded rod, making routine cleaning quick and simple
• Fast Installation: Remove the worn part, fit the new component — done. No specialist knowledge needed

Installation Tip

When fitting the E-Ring (C900J), press the edge into the slot by hand first to seat it, then use a flat tool to push it fully and securely into the groove.

Compatible Filter Models

Hayward Star-Clear Plus: C751 | C7512 | C900 | C9002(S) | C1200 | C12002(S) | C1502 | C17502(S) | C2002

Made in Mainland China.

Why Maintain Your Pool Filter?

A properly functioning cartridge filter is essential for safe, clean pool water. The CDC recommends regular pool equipment maintenance to ensure healthy swimming conditions. Replacing worn knobs and seals promptly prevents water bypass and keeps filtration effective.

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Frequently Asked Questions

Q: Which Hayward filter models is this CX900G and CX900DA knob kit compatible with?

A: This pool filter lock knob kit is compatible with Hayward Star-Clear Plus cartridge filter models C751, C7512, C900, C9002(S), C1200, C12002(S), C1502, C17502(S), and C2002. Always verify your model number before ordering.

Q: What does the CX900DA Knob Kit include?

A: The CX900DA Knob Kit contains 2 × CX900W Washers, 1 × CX900D Guide Cone, 1 × C900J E-Clip, 1 × CX900H O-Ring, 1 × CX900F Filter Head O-Ring, and 1 × ECX1322A Directional Vent Valve with O-Ring — everything you need to fully restore the top assembly of your cartridge filter.

Q: How difficult is it to install this pool filter knob kit?

A: Installation is straightforward. Simply remove the damaged or worn component from your filter and fit the new replacement part. The guide cone helps align the filter lid onto the threaded rod easily. For the E-Ring, press it into the slot by hand first, then use a flat tool to seat it completely.

Q: Will this kit stop my pool filter from leaking at the top?

A: Yes. The CX900DA kit includes the O-rings and vent valve that seal the filter housing top. Replacing worn O-rings and the directional vent valve is the most common fix for leaks occurring at the top of Hayward cartridge filter housings.

Q: Is this knob kit weatherproof for outdoor pool use?

A: Absolutely. The CX900G locking knob is made from high-grade waterproof and UV-resistant material, making it well-suited for year-round outdoor pool environments.