Automatic circular saw with drive chain for wide diameter pipes Walther Flender It is a red found motor from the German brand Walther Flender, which specializes in electric motors, managed motors and transmission systems. The cutting mechanism: The device incorporated a red protective housing (with the black and silver brand label, probably from the machine manufacturer such as Rothenberger or similar) and a robust driveline that surrounds the cutting tube. Controls: A remote electrical control box with a green on/off push button is connected to the motor via a power cable.