Hi there Doug! Happy to help. In some instances there is a part number stamped on top of the top of the filter. If thats not the case, then we can locate the correct filter by the year, make, and model of your hot tub. If you dont have any of those pieces of info, bring your filter into one of our showrooms and we can find a match according to dimensions, how it attaches to the spa, etc.
In the manual or just look up the model number inside the access panel and the dealer should be able to get the part number from that. Don't forget to include the year the tub was manufactured.
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