1.5ml Crimp Top Vial for SHIMADZU--Aijiren Vials for HPLC/GC. 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.