Bonded, closed top screw cap with 18-400 thread to tightly seal storage vials (702098) for liquid samples for a longer period of time. Septa is firmly connected with the cap and cannot be removed. Please note that this PP closure cannot be used in combination with screw neck vials 702866, 702826 and 702826.2, as the 18-400 thread design of this cap differs from the non-standardized one of the vials.