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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
The Pentek 163516 is the correct replacement O-ring for the following ultraviolet water filtration systems:
The Pentek O-ring for Quartz Sleeve UV-110 & UV-120 prevents water from leaking around the quartz sleeve. This O-ring kit for quartz sleeve only needs to be replaced if it wears out.
The Pentek 163516 specifications: