Features: 1. Mainly used in twi-heat exchange pressure solar water heater system. Withstand pressure up to 0.8 Mpa. 2. Unique structure detaches the hot from cold liquid pipeline which rise its heat transfer efficiency. 3. Freezing resistance: -35℃ 4. Maintenance free, warrant your enjoying clean hot water for years. 5. Ideal for domestic solar water heater system and commercial solar water heating applications