black phenolic hole cap, thread for 8-425, PTFE/silicone, septum thickness 1.5 mm, for use with 2 mL screw thead vial, 4.6 mm opening, pkg of 100 ea. Expand. Hide. 27262. 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.