20 Ml Glass Vials at EPA storage vials for water analysis Scientific 20 mL,30 mL,40 mL and 60 mL vials in clear and 20ml headspace vials price glass of 1st hydrol. class glass Bonded Silicone/PTFE closures,thread design 24-414,open/closed top,most frequently used in coination with the 40 mL vial Vial container available for 20 mL,30 mL