SS-QC4-D-4PF
Swagelok SS-QC4-D-4PF Quick Connect Stem W/ Valve
This unbranded generic item is a solid choice when you just need the basics.
Swagelok SS-QC4-D-4PF Quick Connect Stem W/ Valve
The MOS2 3-4 ยต Fisher (15-30 Microtrac) model is a favorite in research facilities.