... customers 2.Working speed :6m-8m/min flexible duct connector machine The machine is composed by two lines ... company:Our main products: spiral tube forming machine, flexible duct forming machine, auto roof forming machine, riveting ... 57841819Tel:+86-21-57842040Phone:+86-13817091187 flexible duct connector machine,soft connector duct/pipe,tube connector machine,round duct connector,duct connector maker