I bought the filter as a better alternative to the p5 filters as Culligan does not offer a serrated filter. I have an HF-360A housing that uses p5 filters. This filter is actually just under 10 inches, while the P5 filter is actually 9-13/16 inches. P5 fits perfectly, this filter did not allow me to fully screw the case. Luckily I had several P5s on hand. my filter and housing were listed as compatible in the description.
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