SBKJ Duct Zipper is a Seam Closing Machine that closes Pittsburgh seams. This machine is suitable for different variety of ducts – Transverse Duct Connector (TDC), Transverse Duct Flange (TDF), or slip and drive (S and C cleat) type duct work. It can perform the operation in a fraction of the time and it works silently. The Ducts are kept in vertical position on the machine. The machine is hydraulically operated. Duct zipper closes the Pittsburgh lock accurately, forming a good leakproof joint, It creates a beautiful and elegant finish, low noise and tight and neat seal.