20mm Aluminium Crimp Cap, Open Hole, Silver with Pre-fitted beige PTFE/White Silicone Septa HT Grade, 3.2mm

Alternative to:
La-Pha-Pack: 20 03 0901, National: C4020-32A, Agilent: 5183-4477, Fisher: 11590505, VWR: 548-0593