20mm Tin Plate Magnetic Crimp Cap, Silver, Open 8mm Hole with beige PTFE/Cream Silicone Q-SEP Septa, 3mm

Q-SEP Septa are the cleanest septa available. With no peak interferences, these septa are a softer material, Shore A 38, compared to Shore A 45 for other septa, which makes penetration much easier. These septa are the most popular choice for many laboratories.