Screw-Vial Closure^ Screw-Vial Closure 2mL, 9 mm Short-Cap, Type: Screw-Thread, Color: Natural, Septa Material: PTFE/Silicone/PTFE, preassembled, to reduce the risk of needle bending, release vacuum from high-volume injections and improve injection reproducibility (greater than 20% of vial volume)