Push in fittings:
Additions:
page 98 in the catalogue, the 3800 and 3900 series, more resistant 3901 12 17 and now im thinking, instead of push in, thread (like the ones we saw in the vacuum workshop), something like: 0101 16 17 but in stainless steel
3901 12 17
from legris here https://www.kistenpfennig.com/de/ an 17.4.2019