Polypropylene Autosampler Vials for HPLC or CE Polypropylene Vial, Amber Caps Sold Separately. 97051-420 Polypropylene Vial, Clear Caps Sold Separately. 97051-422 Screw Caps w/Sili/PTFE Septa. Blue. 97051-426 Screw Caps w/Sili/PTFE Septa pre-slit. Blue.