The assembly system for modular tubing (MULTIFORM and KMH) is both simple and rapid. Place the connection flange or pull-ring one-part so that it embraces the flange of one of the parts to be connected, the next part is positioned, with its flange inside the pull-ring one-part, embracing both flanges entirely before finally bolting tight.
There are variations on this basic design with double bolts or with quick closing devices.
A second variation is airtight modular tubing. In this case the seal is placed over the flange of the parts to be connected after placing the other in position and of the pull-ring one-part.