Its a "MULTIDOSAE VIAL ACCESS SPIKE" there tons of dif kinds but mine are like 10G spike w/ a control valve.. it pulls so nice.. its like a spiked plunger thing that adheres to the top of a vial so u don thave to use a pin to pull just put syringe up to it.. and blamo SUPER DUPER FAST pull and u kan use the pin that CAME w/ your syringe to shoot with since it is unused!
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