Watts ET-30 Series ETX Non-Potable Water Expansion TankThis 4.5 gallon non-potable water expansion tank is 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. The pre-pressurized steel tank features a durable expansion membrane that prevents contact of the water with the air in the tank. This rugged diaphragm minimizes loss of the air change and ensures long and trouble-free life for the system. Maximum pressure is 75 psi (5.3 bar).Designed to control hot water in closed loop heating systemsNPT male connectionDurableEasy to useMaximum pressure is 75 psi (5.3 bar)Diaphragm minimizes loss of the air changeEnsures long and trouble-free life for the systemDurable expansion membrane that prevents contact of the water with the air in the tankMaintain system pressure below the relief setting of the relief valveNon-potable water expansion tankNote: product may vary by storeDimensionsProduct Depth (in.)11.1 inProduct Height (in.)14 inProduct Width (in.)11.4 inDetailsApplicationNon-Potable WaterCompatible Brand/Modelcommercial and residential closed loop hydronic heating systemFinish FamilyGrayMaterialSteel TankNominal Tank Capacity (gallons)5 galPack Size1Product Weight (lb.)8.5 lbAdditional ResourcesFrom the ManufacturerWarrantyInstallation GuideUse and Care ManualInstructions / Assembly