Autosampler Vials, Caps, and Closures. DWK Life Sciences Kimble™ Open-Top PolypropyleneScrew Thread Closures with Red PTFE-Faced Silicone Septa. Autoclavable and used for multiple injections. Pricing and Availability. aijiren Techbrand™ 9mm PP Short Thread Seal, Blue, Center Hole, Assembled Septum.