joint size??

Hi all,
 
So my question is, i orderd an 14.5
\tBlack Leaf - Glass Slide Bowl with Built-In Blue Glass Disc Screen link:http://www.grasscity.com/eu_nl/black-leaf-glass-slide-bowl-built-in-blue-glass-disc-screen.html#.UrXgFPTuIfh
 
For this bong (see link)
http://www.blackleaf.de/index.php/eisbong-black-leaf.html
 
it says its 14.5
 
I measured my joint size its around 15 but will that fit did i orderd the right one?
 
Thanks,
 
Greetz Tom