I used the needle of a 18ga luer-lock syringe needle and jammed it into the drip top of a 30 ml bottle. I removed the actual stainless needle from the plastic of the syringe mount. I drilled a hole in the 30ml bottle cap to prevent the drip top from popping off.
If you can't locate what you're looking for, this is a solution to make your own. Good luck!