What are these media bottle caps called?

[Deleted member 127229]

I remember seeing these a few months ago but I forgot what their called. They screw in 33mm and 45mm media bottles so you can use a syringe to remove liquid while the cap is still on the media bottle.

 

[qadsan]

GL45 open top cap and GL45 septas. You’ll find them on Amazon and other places.