4m suction arm, dia. 200mm. Suction arm hose-type with internal joints for mobile filter units. The suction arm consists of an internal linkage made of aluminium. Due to the convenient arrangement of the springs it is very easy to move the suction arm in every requested position. It is possible to turn the suction hood with integrated throttle valve in every direction. The arm can be used for mobile units and also for wall mounting after changing the position of only one screw.