Watts 0066608 Etx-90 15 Gallon Non-Potable Water Expansion Tank

This non-potable water expansion tank is designed for use in commercial and residential closed loop hydronic heating system piping to control the thermal expansion of hot water and maintain system pressure below the relief setting of the relief valve. This carbon steel tank is pre-charged at 12 PSI tank volume is 2.1 gallons and features a durable expansion membrane that prevents contact of the water with the air in the tank.