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A complete 20" filter cartridge housing. This unit has the bottom piece that holds the filter and also the top plastic piece that the inlet and out...

A replacement 10" filter cartridge housing. This is just the bottom piece that holds a 10" cartridge filter for an RO.

A small black o-ring that goes in top of the plastic housing for cartridge filter. This o-ring also fits the the stainless cartridge housings. This...