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Rainbow/Pentair RTL-25, model R172502J is a 2"s top load filter.
For use on portable spas, it is designed to mount in a niche so that the main body is under the shell of the spa, while the top is accessed from above the spa.
This complete filter includes:
The diameter of this filter canister is 6-1/2".
The diameter of the hole in the niche is 6-5/8".