4 gallon bladder tank for pressurized storage of ultra pure water. Small size for easy installation. 1/4 inch quick connect tank valve and stand included. P.A.E. RO TANK FEATURES: • NSF listed materials.• Pressure tested to 300 psi.• Proven diaphragm design – Built to last.• Durable steel shell.• Pre-charged at 5-7 psi.• 5-year warranty.• Each tank individually tested.• Can be installed horizontally. INCLUDED 1 - 4 gallon total capacity bladder tank and 1/4 inch quick connect tank valve. 4' - 1/4 TUBING POLYETHYLENE 5 Year Warranty