Push in fittings:

• Should look a bit pretty
• Sample typ: 3601 14 17
• https://www.parker.com/literature/Denmark/Catalogue_Web_EN.pdf
• max outer dimension 22mm, should allow for a pipe as large as possible
• valid for stainless steel pipe?
• temperature -25/-30?
• alcohol resistant?
• Steel 316 should be ok
• o-ring (resistant)
• paralel thread

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

• I asked for an offer of 5x3901 12 17 from legris here https://www.kistenpfennig.com/de/ an 17.4.2019