1/2 to 3/8 Reducer Faucet Adapter - Compression Brass Pipe Fitting, 3/8 Male to 1/2 Male Supply Line Adapter for RV Kitchen Plumbing, Water Hose Pipe Connector with Rubber Washer, (2 Pack) - Amazon.com
Q-railing 140754-042-12-XCP4 Glass adapter, tube 1.66", - pack of 4
15x150mm 20x200mm Glass Drying Tube Adapter U Shape With Side Arm Labware Absorption - AliExpress
VAQTEC
Ideal Vacuum | Swagelok Ultra-Torr Adapter Fitting 1/8 in. OD Glass, Metal or Plastic Tubing to 1/4" OD Tube Stub, PN: SS-2-UT-A-4
Ideal Vacuum | Conflat Flange (CF) Borosilicate Glass Adapter 1 inch to CF 2-3/4 inch, Schott 8250, Kovar, CF 2-3/4 inch
0.62" OD Open Pyrex Glass Adapter on 1.33 CF Flange