If you are planning to buy or import best high-quality air conditioning 

free joint from professional company, factory, exporter, and seller, 

please feel free to contact Shanghai Guya, we are one of the top level

 China air conditioning free joint manufacturers and suppliers 

Free joint RG130/ RG100/ RG80

FREE JOINT (for air conditioner Installation)

Free Joint is used for connecting ducts where there is an obvious

 obstacle between two ducts in the same wall.

http://www.guya-ducts.com