Flotec FP7120 Vertical Pre-Charged Pressure Water Tank, 35 Gallon Pre-charged pressure tanks require 50 % less space than standard conventional tanks Provides greater water capacity between pump cycles for maximum system life Tough, appliance-like finish for extended life.Equivalency Rating is 82 gal.Tank Capacity is 35 gal Water never touches metal components.Replaceable air/water separator for easy maintenance; Convenient air valve location for quick hook up TANK PRECHARGE:40 psi Nitrogen-Rich Charge