Combined with copper outer tubes, carbon steel inner tubes, precision machined gasket surfaces, and fully expanded tube depth, this design assures efficient, dependable performance.
镀铜外管、碳钢内衬管、精密加工的密封垫表面以及全扩展的管深度，保证了高效和稳定的性能。
It has great filling volume and big tube diameter, with inner heating and outer heating.
灌装量大，软管直径大，也有内加热和外加热两种类型。
This coated inner tube is closed at one end and sealed at the other end to the outer tube.
内管的涂层是介于一端与另一端的外管的密封层里面。
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