Please see assembled caps and septa. The 9mm screw top vials with cap and septa is compatible with autosamplers using 11mm crimp top vials,Wide mouth,Borosilicate glass,Flat bottom,With marking spot,Cap with teflon/silicon/teflon septa,Cap to be packed separately from vials. Features. 1. Short screw Thread ND9 vials(11.6*32mm) for GC and HPLC. 2.