Watts Premier 119008 10-Gallon White Metal Pressure Storage Water Tank PRESSURE STORAGE TANK: The tank is used for storing reverse osmosis water and has been NSF tested and certified against ANSI/ NSF Standard 58 for material and structural integrity requirements WHITE METAL STORAGE TANK: The inside of the tank has a polypropylene liner and utilizes a butyl diaphragm for the water storage area 10-GALLON WATER TANK: It is comparable to the amtrol RO-10 tank. It has extra large storage capacity for high use and light commercial RO systems PRESSURE STORAGE TANK DIMENSION: This pressure storage tank is of opening size 26 x 23.5 x 15.5 inches OPERATING PRESSURE: Powder coated steel exterior, Stainless steel 1/4-Inch male connection to fit RO tubing and has operating pressure as maximum 100 psi (7.43 g/cm2)