SureSTART™ 13 mm Screw Caps, Level 2 High-throughput Applications Thermo Scientific™ SureSTART™ 13 mm Screw Caps, Level 2 High-throughput Applications Catalog number: 6ASC13ST15 Technical Support Customer Service Use Thermo Scientific™ SureSTART™ 13 mm Screw Caps with screw vials that have a 13 mm opening, including our SureSTART 4 mL Glass Screw Top Headspace Vials (Level 2). Select Level 2 products for high-throughput applications, when robustness and reproducibility are key. Choose from polypropylene and polyurethane caps with all-purpose silicone/PTFE septa or PE foam/PTFE septa designed to reduce autosampler needle issues. A pre-slit septa option is available for those who want septa that prevent vial-overfilling issues and re-seal well enough to avoid sample evaporation. Color Black Material Polypropylene Septum White Silicone/Red PTFE Hardness 45 Shore Product Line SureSTART Level 2 Thickness (Metric) 1.5 mm Certifications/Compliance Specification Certified Type Screw, Level 2 Closure Size 13 mm For Use With (Equipment) 13-425 Screw Vials Unit Size Pack of 100