APEC Portable Countertop Reverse Osmosis Water Filter System, Installation-Free, fits most STANDARD FAUCET (RO-CTOP) Hooks up to most STANDARD FAUCET in minutes. Just plug and drink! Lightweight, installation-free system. Its NOT compatible with pull-out faucets, special size designer faucets and sprayer faucets. Top rated brand, high performance reverse osmosis drinking water systems. Highest grade 4-Stage ultra-pure system provides refreshing crisp taste superior to bottled water 90 GPD portable system built with high capacity filters for reliable, long lasting performance, works for water pressure 40-80psi Perfect for apartments, condos, motor homes, retirement homes, seniors, students & travelers