DURO BLOCK- Duro Block operates on a similar principle as the    Duro Lift. This type of gas spring features an integrated valve and    be blocked in any desired position. When the valve is closed, the    gas spring is fixed which enables it to be blocked in any desired    position.

   If the actuator pin plunger is operated, the valve is opened and    the gas spring unit can be moved into any desired position. The    extension speed and the damping can be varied based on the    requirement in different applications.