The Watts WQC4RO11-50PTNF accepts the following replacement filters:
The Watts Kwik Change 50 GPD RO System - No Faucet is a Stage 4 reverse osmosis water filtration system that purifies your drinking water. This undersink reverse osmosis system does not have any sumps and includes easy-to-replace Kwik-Change cartridges. This Watts RO system features automatic shut-off and provides you with high quality water.
Watts Kwik Change 50 GPD RO System - No Faucet specifications: