Elesa+Ganter Indexing plungers GN 817.2 B correspond to GN 817, they only differ by a longer knob.

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.

For materiale speicfications please see datasheet that can be found under Documents.