(2023-04-07, 9:28)Philippe Hurbain Wrote: They do exist for a long time!
https://library.ldraw.org/official/2852
https://library.ldraw.org/official/1517
If you're looking for them in Studio, they are in my pneumatic parts pack available here: https://philohome.com/studio/packs.htm
Without words!
Obviously I didn't search well.
Thanks Philippe and Gerald for the quick reply.