Quote Originally Posted by BBforDAgirls View Post
I hope someone could clear this up for me. When using a .22 syringe filter and filtering straight into a sealed sterile vial (just making small batch).

Does the whatman filter screw on (attach) to the syringe tip then the needle slides on to the whatman tip? I don't see how the needle can be secured on the filter without leaking or possibly become loose since the filter has only one side that screws on.
you are correct: the needle does screw on the filter. Just be sure to buy the filter that actually is threaded for a needle (actually it’s a luer-loc style fitting).