Fittings that screw into 1/4-28 UNF ports and accept tubing that has an inner diameter (ID) of ~1/16" (1.5 mm). 

Comes in choice of two materials: ETFE or PEEK, both of which are autoclavable. 

Compatible with: 

1) 3 mm OD, 1.5 mm ID silicone tubing
2) 3mm OD, 2.1 mm ID semi-rigid tubing from Festo 
3) 1/8" (3.2 mm) OD,, 1/16" (1.6 mm) ID silicone tubing

Single Unit.