Wilkins XT-35 9 Gal. XT Thermal Water Heater Expansion TankThe 9 Gal. XT-35 Thermal Expansion Tank is utilized on potable water lines between the backflow preventer or pressure reducing valve and the water heater for protection against water thermal expansion in residential applications. As the system pressure increases, water enters the polypropylene-lined water chamber of the tank, expanding a diaphragm into a pre-charged air chamber to keep the system pressure below the relief valve setting. Materials include a carbon steel shell with an epoxy finished coating, and corrosion-resistant stainless steel connection with a polypropylene liner and Butyl rubber diaphragm.Pre-charge is field adjustable for convenient maintenanceCarbon steel shell with polypropylene liner ensures long-lasting constructionDiaphragm style tank is ideal for thermal expansion protection in residential applicationsStainless steel connection resists corrosionLow-lead law compliantIAPMO listedWater quality association certified to NSF/ANSI 61 and 372Easy to install1-year limited warrantyBrand name you can trustDimensionsProduct Depth (in.)13 inProduct Height (in.)19.75 inProduct Width (in.)13 inDetailsApplicationPotable WaterCompatible Brand/ModelZurnFinish FamilyBeige/BisqueMaterialCarbon SteelNominal Tank Capacity (gallons)9 galPack Size1Product Weight (lb.)15.3 lbAdditional ResourcesFrom the ManufacturerWarrantySpecificationUse and Care ManualInstructions / Assembly