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Coupling system

[Source:www.tdvent.com] [Coupling system]
Steel ring coupling
        The tubing is manufactured with spring steel rings at each end.the ring end of one tube is inserted into the ring end of the next length of tubing being installed.this connection provides a secure fit and extended the service life.
Zipper coupling
        The zipper coupling is made by sewing one side of a zipper assembly to the first duct at a connection poit.the second duct contains the coordinating zipper teeth to form a secure female entry and male exit.This is connection is widely used for large diameters,It's convenient for fold and transportation.
Snap clasp coupling
        The snap clasp copling produced with soft ends with hooks one end and D rings the other end complete with cuff to go into next section.this connection provide a more efficient system with less air leakage and faster installation.
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