I ordered this for use in the Watts(R) brand, large blue font, whole house filter. The original specification was 20" x 4.625". This filter (20" x 4.5") fits perfectly. A slightly smaller diameter meant a little more work to level it out. The order was quickly completed and shipped. It came complete and on time. Time will tell, but if it works we will be regular customers. Buying an OEM watt filter is not easy for a consumer in our area. We value fast service.
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