4 pcs RO Reverse Osmosis pre filters. All filters are Premium NSF Certified. This universal set s compatible with all major RO Systems with standard size housing. Also Compatible With:, 5EZ50, GTS-550S, NRO05-50, 200-GX-5050, ISO-RO5, GTS-550, Tier1 RO5-WF, RO550-W, W-525, and Many More.
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