TankDepot.com offers HDPE and XLPE tanks for DEF tanks. DEF tanks are offered in a SG 1.5 or 1.9. Some of the common sizes used for DEF are vertical tanks ranging from 50 - 16,500 gallons and horizontal leg tanks from 35 - 5025 gallons. We also offer double wall tanks and cone bottom tanks for DEF applications. We also offer heat tracing and insulation to keep the diesel exhaust fluid at a desired temperature. TankDepot.com recommends PP or SS for the fitting material and EPDM or Viton for the gasket material. We offer over 40 different locations across the United States and have many tanks in service for DEF. Please contact our sales staff for any questions or requests for quotes.