OEM Waterway Filter Lock Nut 550-7500 is a high-strength replacement component engineered for Waterway ClearWater II cartridge and D.E. filter systems. This lock nut securely fastens the filter lid to the tank, ensuring a leak-resistant seal critical for proper filtration performance. Constructed from durable materials to withstand pool chemicals and pressure, it is a reliable part for both routine maintenance and long-term system efficiency. Compatible with a wide range of ClearWater II models, this OEM nut helps maintain filtration integrity in residential and commercial pool environments.

• Fits ClearWater II Filter Models: Specifically designed for use with Waterway ClearWater II cartridge and DE filter systems for exact fit and dependable performance.

• Secures Filter Lid Tightly: Ensures the filter lid is properly fastened, forming a reliable seal that prevents leaks and supports optimal filtration pressure.

• Built for Harsh Pool Conditions: Manufactured from rugged, pool-safe materials that resist cracking, fading, and chemical exposure over time.

• Essential for System Integrity: Helps preserve the filter tankÕs structural and operational integrity by maintaining secure lid placement.

• Long-Term Maintenance Solution: Ideal for replacing worn or cracked lock nuts to restore proper function to aging filtration systems.

• (1)ÊWaterway 550-7500 Lock Nut

• Waterway ClearWater II Cartridge Filters
• Waterway ClearWater II DE Filters

• Bottom Outside Diameter: 17"
• Bottom Inside Diameter: 17-5/8"
• Top Diameter: 16"
• Entire Diameter: 20-3/8"

Note: See product pictures for a visual of the dimensions

Find the Right Lock Nut for ClearWater II Filters

waterway 550-7500 filter lock nut replacement

clearwater ii cartridge filter lid lock nut

de filter lock nut for waterway 550-7500

secure lid for waterway clearwater 2 filter system

compatible nut for clearwater ii housing top

Maintenance and Leak Prevention Queries

filter lid leaking replace with 550-7500 lock nut

water spraying from top of filter use oem nut

how to tighten waterway clearwater ii filter lid

best way to seal cartridge filter top housing

clearwater de filter lid wonÕt stay tight

Specs and System Fitment

fits all waterway clearwater ii filters

durable plastic nut for sealing filter tops

locks down lid to maintain filter pressure

high quality thread for long-term use

oem waterway part number 550-7500