DAO (Daoyunai) Energy Saving Technology Limited has been committed to manufacturing trenchless rehab UV CIPP cure systems with liners and CCTV inspection crawlers for the underground pipeline to service customers worldwide.

The product range covers four series and more than 20 models in the underground pipeline trenchless repair industry:
1. UV curing and repair integrated system D919: LED lamp curing and high-voltage mercury lamp curing
2. UV cure liner: from diameter DN200 up to DN1800
3. Hot water cure liner: impregnated liner to invert by water gravity and cure by hot water
4. Pipeline inspection robots crawler D18 and D18s: CCTV video inspection of pipeline defects
5. Pipeline periscope D16S: quickly  view the internal defects of the pipeline

Headquartered in Shanghai, Daoyunai has several independent intellectual property rights and a manufacturing base and R&D and testing center in Suqian City, Jiangsu Province, covering an area of more than 35000 square meters fully implementing the international quality management system.

With the service tenet of "comprehensive innovation and constantly exceeding customer expectations", DAO serves the customers of underground pipeline inspection and trenchless repair with high reliability, high quality, high efficiency, highly competitive price, and a perfect after-sales network.

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