PTFE/ silicone septum for 2ml, 4ml, 10ml HPLC vials. color is red, blue, white ,natural . septa ptfe/silicone septum ... 1.use for hplc,autosampler,chromatography,Agilent,waters machine2.glass vials with 8mm PTFE/silicone septa liner3.avaible volume:2ml,4ml ...