PTFE/red rubber, diam. × thickness 16 mm × 0.060 in., for use with 15 mL vial. Pricing. 27178. PTFE/red rubber, diam. × thickness 18 mm × 0.050 in., for use with 22 mL vial, pkg of 100 ea. Pricing. 27233. PTFE/red rubber, diam. × thickness 20 mm × 0.125 in., for use with 20 mm crimp seal, 22 mm screw cap.