Watts PLT-5 Potable Water Expansion Tank 0067370 ~ NEWThis potable water expansion tank is used on gas, oil, or electric, direct fired, residential water heater and hot water storage tank applications to absorb the increased volume of water created by thermal expansion. It also maintains balanced pressure throughout the water supply system by keeping system pressure below the T&P relief valve setting. This field adjustable steel tank is air pre charged at 20 psi, volume 2. 1 gallons, designed with an FDA