It doesn't have an item - you never spawn or pick up spraycans in the default game. All item types are the same apart from the model/uiName, anyway.
why not just open the spray can mod and look at the files?
Because the spray can isn't a mod, and i'm quite sure that its part of the main code/engine of Blockland.
You mean the Fill Can.
While this topic is here, and since this may help Demian at some point, what function is called when a player paints a brick? And I'm not talking about colorXPaintProjectile.onColli sion(), but the most general one that is called every time.