This (male) luer lock bottle cap will allow you to attach a needle, or anything with a (Female) luer lock fitting directly to the bottle. 

When used in conjuction with our special Plunger Kit fitting (Patent Pending), these caps make filling cartomizers easier than ever. 

Bottle Fit Chart:

15mm caps will fit - 15ml Dropper Bottles

20mm caps will fit - 30ml Dropper Bottles, 60ml Dropper Bottles, 60ml HDPE Bottles