Love the Dragon.  It hasn't rained to where the water spews out its mouth yet, perhaps I'll have to simulate it with the hose, but nonetheless it's really cool looking.  We've only had drizzles since receiving it.  Fit our downspout with ease, had to bend the edges a little to fit snug, and it fits perfectly.  The back of the head is wide open and you slide your drain into it for a tight fit and that's where you will customize it if needed to fit tight.  Hope this helps!!  I will be buying another one in the future ... Makes a great garden piece as well ;+)