PTFE/Natural Rubber Septa, 12mm x 1.3mm, for 13-425 Thread Caps

Alternative to:
La-Pha-Pack: 12 02 0223, Chromacol: 12-6RT1, National: C4015-30 (alt.), Agilent: 9301-1031, Fisher: 11814950, VWR: 548-0476