Hole diameter: 8mm(7) With hosing box for terminals3. ConnectionNote:Please kindly note that Delta connection CANNOT be switched to either Star-Delta connection or Star connection.Star-Delta connection and Star connection CAN be switched to each other.4. Installation5. Flanged Heater Applications1). Heating heat transfer fluids2). Heating medium and lightweight oils.3). Heating water in tanks.4). Pressure vessels.5). Freeze protection of any fluids.6). Food processing equipment.7). Cleaning and