Indexing plungers GN 608.1 with rest position are used for such applications where the plunger has to stay in its retracted position. To achieve this, the knob is rotated by 90° degrees after being retracted. A notch keeps the plunger in this position. Indexing plungers GN 608.1 are distinguished for their small dimensions. The locking tab is integrated into the knob thus giving reliable operation at all times.