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![R0357800 is a black rubber o-ring with a cross section of approximately .625". This o-ring seals the top and bottom halves of a Jandy CV series filter.](http://mysanjuanpools.com/cdn/shop/products/R0357800_436x436.jpg?v=1645555415)
Replacement Jandy Tank Body O-Ring. Replaces Jandy DE Filter DEL Series, and CV Cartridge Filter Series.