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Includes two (2) rubber o-rings. Free shipping. Fits standard size 10″ slim line housings including the PS-PURUF, Watts Premier reverse osmosis housings, other conventional RO systems, and more.
Each housing requires one (1) o-ring so systems with two housings would need two o-rings to replace the entire system. If your system only has one housing, use one o-ring, and store the other for another time (long shelf life).