![50 SQ FEET CARTRIDGE - Fits Hydropool Serenity tubs (2019 & earlier)](http://store.budsspas.com/cdn/shop/products/PRB50-IN-angle-view_{width}x.png?v=1617044824)
Diameter: 5"
Length: 13-5/16"
Top Hole: 2 1/8"
Bottom Hole: 2 1/8"
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Diameter: 5"
Length: 13-5/16"
Top Hole: 2 1/8"
Bottom Hole: 2 1/8"