Waterway 550-7500 filter locknut assembly for the Clearwater II cartridge filterWaterway Clearwater II Filter Locknut Assembly 550-7500 In stock$8699
Waterway 550-7500 filter locknut assembly for the Clearwater II cartridge filter
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Waterway Clearwater II Filter Locknut Assembly 550-7500

Ask a questionMPN 550-7500
$8699
In stock
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Quick overview

  • Two pieces in one part The assembly is the locknut plus the threaded retainer ring, supplied together.
  • Holds the cartridge down The locknut is what clamps the element into the filter body so water cannot bypass it.
  • For Clearwater II Sold as the replacement locknut assembly for the Waterway Clearwater II cartridge filter.
  • Top inside diameter 15-11/16 inches Measure the old assembly against this before ordering.
  • Bottom inside diameter 16-7/8 inches The second dimension to check, since the two ends are not the same.
  • No special tools It threads into place with the filter open, using nothing beyond what a cartridge change already needs.
Full description and specifications ↓

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Product details

The Waterway 550-7500 is the filter locknut assembly for the Clearwater II cartridge filter. It comes as two matched pieces, a locknut and a threaded retainer ring, which is how the filter holds the cartridge in place.

Why it matters

The locknut assembly is the clamp that keeps the element seated in the filter body. If it is cracked, stripped or missing, the cartridge can lift or sit off center, and water takes the easy route around the media instead of through it. The filter keeps running and the pool keeps getting dirty, which makes this an easy fault to blame on the cartridge.

Check the dimensions

The top inside diameter is 15-11/16 inches and the bottom inside diameter is 16-7/8 inches. The two ends are deliberately different, so measure both against your old assembly rather than assuming from a photo.

It fits without special tools, in the same access you already have when the filter is open for a cartridge change.

Specifications
Brand Waterway
Manufacturer part number 550-7500
UPC 806105486097
Type Filter locknut assembly
Includes Locknut and threaded retainer ring
Top inside diameter 15-11/16"
Bottom inside diameter 16-7/8"
Part type Pool filter part
Fits Waterway Clearwater II cartridge filter
Shipping weight 10 lb
Ships Parcel

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Questions and answers

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

What is in the assembly?
A locknut and a threaded retainer ring. They are supplied together because they work as one piece.
What does the locknut actually do?
It fastens the cartridge into the filter body. Without that clamp the element can lift or shift, and unfiltered water slips past it straight back to the pool.
Which filter does it fit?
The Waterway Clearwater II cartridge filter.
Do I need tools to fit it?
No. It installs without special tools or equipment, in the same access you already have when changing a cartridge.
Ask your own question