The only off the shelf parts are the NPT ball valve and two NPT-to-SwageLok/YorLok adpaters
     The ball is "full port" so the hole/port is large enough to pass the sample holder

McMaster P/N 46495K21: Ball valve 316 stainless with PTFE seats and seals
     1/2 in. NPT Female
     End-to-End Length 2 3/8"

McMaster P/N 5182K135: YorLok tube fitting
     316 stainless Straight Adapter
     1/2" Tube OD x 1/2 NPT Male

Pastey gluey to put at their junction
     Torr Seal Epoxy (Agilent) - low vapor pressure epoxy


-The box with viewport were scavenged from a retired vacuum system
      viewport glass dimensions, if butterfingers
         4.75 x 2.78 x 0.31 in.
         121 x 71 x 8 mm
      beveled corners:
         edge 3/8 in, 10 mm
         diagonal 19/32 in, 14mm

New isolation valve:
Ball valve - https://www.idealvac.com/Ball-Valve/pp/P103568

Kal-rez orings - https://www.idealvac.com/Kalrez-Centering-Ring/pp/P106146 or
                 https://www.mcmaster.com/9568K68/