For the most part normal center post 24ga. Thrown twisted parallels at it, 3 x 26ga parallels at it, nanos... It seems to do good all around. One thing I don't like though is the negative post air holes IMO they should be higher than the wells rim. Thicker juice seems to be okay, but thinner seems to leak. May be because of the way it sets screwed onto the box I've got it on ( how I tilt it too ), but I find myself closing those ones a lot.