Mastelf 11mm Neck Amber Crimp Top Vial with Cap Septum, designed for Aijiren, Waters, Varian and Shimadzu Autosamplers, provide trouble-free operation. 2ml Crimp ND opening, Crimp Type. Compatible with ND 11 PTFE Silicone Septa Aluminum Crimp Ca p. About Us. Mastelf, as a Based supplier of providing laboratory products,which is specialized in