Pricing. SU860078. black polypropylene hole cap, thread for 13-425, red PTFE/silicone, septum thickness 1.5 mm, for use with 4 mL vial, 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.