2ml Crimp Top Hplc Vials for SHIMADZU. 2ml Crimp HPLC Vial requires a relatively inexpensive painted aluminum crimp cap. When properly assembled, it will become the best seal for long-term storage. 2ml Crimp HPLC Vial with Cap needs to be used with crimper and cap opener. The crimp cap cannot be reused, it can only be used once.