Kit with vial and cap + septum, consisting of 20 ml precision thread vial, 18 mm screw neck, precision thread, clear 1st hydrol. Class glass, round bottom, 75.5 x 22.5 mm; silver precision thread magnetic-cap, 18 mm screw thread, with 8 mm center hole; septum white / blue silicone /PTFE, 55° shore A, 1.5 mm thickness, UltraClean