black polypropylene cap, for use with 2 mL vial (large opening), pkg of × 100 ea. Expand. Hide. 27052. black polypropylene cap, thread for 8-425, for use with 2 mL vial (standard opening), pkg of 100 ea. Expand. Hide. 24765. yellow polypropylene hole cap, thread for 8-425, no septum, pkg of 1000 ea.