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 magnetic-cap, 18 mm screw thread, with 8 mm center hole; septum blue transparent / white silicone / PTFE, 45° shore A, 1.3 mm thickness, UltraClean