black polypropylene hole cap, thread for 8-425, PTFE/silicone, septum thickness 1.5 mm, for use with 2 mL vial (standard opening), pkg of 100 ea. Expand. Hide. SU860076. black polypropylene hole cap, thread for 8-425, PTFE/silicone (red PTFE/white silicone), septum thickness 1.3 mm, for use with 2 mL vial (standard opening), pkg of 100 ea.