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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
The Hydrotech SL O-Ring R is the correct replacement O-ring for the following filter systems:
The Scaleless Comp. Housing O-Ring- SL10-1 & SL20-2 is a replacement O-ring for use with the Hydrotech Scaleless model SL10-1 and SL20-2 water filter systems. This Scaleless O-ring fits standard 3/4" housings and valve-in-head housings.