Screw neck vials (EPA), N 24 MACHEREY-NAGEL 20 mL, 30 mL, 40 mL and 60 mL vials in clear and amber glass of 1st hydrol. class glass Bonded Silicone/PTFE closures, thread design 24-414, open/closed top, most frequently used in combination with the 40 mL vial Vial container available for 20 mL, 30 mL and 40 mL vials. Vials are packed