20mm x 3mm Beige PTFE/White Silicone Septa for 20mm Aluminum Seals

Alternative to:
La-Pha-Pack: 20 02 0638, Chromacol: 20-ST3HT, National: C4020-32, Agilent: 9301-0719, Fisher: 11805030, VWR: 548-0573