Sigma screw top VOC vials--glass sample vials MilliporeSigma 27138 Sigma-Aldrich 4 ml Clear Vial, Screw TOP. Sigma-Aldrich 27138 Screw Top Vial with Solid Green Melamine Cap with PTFE Liner, Preassembled, 4mL Capacity, 45mm OD, 15mm Height, Glass, Clear, Pack of 100.