81506720 is a pneumatic timer from Crouzet designed for timing control in pneumatic systems. This timer is compatible with the 79 451 903 panel mount knob for manual timing setup. The modular system elements are fixed with two screws on a sub-base, with a locating device on each element to prevent incorrect assembly. Elements are connected via the sub-base which has 3 instant connections for connecting semi-rigid tubes with outer Ø 4 mm. Common applications include industrial automation and pneumatic control systems where precise timing is required.