20mm Crimp caps, silver, aluminum, with PTFE/silicone septa, 100 pc/PAK

The Supelco 27455-U Crimp caps with PTFE/silicone septa are silver aluminum caps with a pressure release open center, and are designed for use with 20 mm crimp top vials. The PTFE/silicone septa provide a secure seal for the vials. These seals are compatible with 6mL, 10mL, and 20mL headspace vials, and they are designed to ensure minimal contamination for septa impurities.