PTFE Silicone Septa For Screw-top HS Autosampler vials Contact Now Product Description PTFE Silicone Septa For Screw-top HS Autosampler vials Description Unit Part No. 17.5mm Bule PTFE/White Silicone 1.5mm (.060") thick 100/pk 18-SP1001 17.5mm Red PTFE/White Silicone 1.5mm (