The 3M 66-4506G2 is the correct replacement RO membrane for the following countertop RO systems:
The 3M CUNO SQC TFC 25 GPD RO Membrane 66-4506G2 is a reverse osmosis (RO) membrane water filter. This RO membrane will help provide you with clean, pure, great-tasting drinking water. This replacement membrane has a capacity of 25 gallons per day.
The 3M 66-4506G2 specifications: