I remember that It was supposed to be 20ml size syringes that fit, BUT I tried using terumo brand....and they did NOT fit. close but we all know close only counts in 2 things. Maybe B-D brand might be a better fit, or another brand (not really familiar with syringe brands like that ; / ) or maybe (not yet , get some sleep faceless)the man might fabricate a nice unbreakable SS tank to sell us "butter fingers".