About This NOMINAL VS USABLE CAPACITY: Rated at 4.5 gallons nominal air capacity, providing approximately 3.0 gallons of usable filtered water depending on system pressure. DESIGNED FOR RO SYSTEMS: Compatible with most standard under-sink reverse osmosis filtration systems using 1/4" tubing connections. DURABLE CONSTRUCTION: Powder-coated steel tank with corrosion-resistant internal liner for long-term performance. CONSISTENT WATER DELIVERY: Pre-pressurized design helps deliver steady water flow to your RO faucet. INSTALLATION NOTE: Actual usable capacity may vary based on incoming water pressure and system configuration. Overview Brand : Neo-Pure Special Feature : Shutoff Valve included Product Dimensions : 11.35"L x 11.4"W x 14.7"H Material : Stainless Steel Capacity : 4.5 Gallons Included Components : Shutoff Valve Package Information : Box Installation Type : Under Sink Purification Method : Reverse Osmosis Model Name : NPROT-4.5