Replying to Stoner NS: Problems With a New Ashcatcher

Just spent a good amount of money on a brand name 6 arm tree perk ashcatcher for my straight tube bong. Problem is, the joint does not quite fit in the downstem and i am really frustrated by this.

Is there a male and a female connection? do i need an adaptor? not sure on exact size of both but im assuming they are both 14.5mm, neither are very large. Also got a seporate slide, and it is the same size as the ashcatcher. Wish i was in the 420 cult but no such luck, any help would be great.