Corrosion-resistant, vertical two-gallon Tank is pre-charged to 20 PSI. Minimizes motor heat rise, pulsating water flow, switch operation and pump cycling to help your fresh water system operate more quietly and efficiently, plus it helps maintain constant water temperatures. No taste or odor from internal bladder. Draws down to .7 gallons. 1/2" female NPT port. Easy to install, maintain and winterize. Stainless steel construction for maximum corrosion resistance.