I would have fun dumping that trap and a rat in a 5 gal bucket full of water.

I have had great success with this: http://www.thehuntinglife.com/html/sections/articles/ferreting_trapping/victor-rat-trap.html

The one on the left with all the mods. I also cut the plastic tab about a 1/8 inch above the V so the rat must get his head in further before he gets wacked. I use pencil led for the chin bar.

Victor's are must because the wire is heavier and stronger. Use peanut butter (not chunky). If you don't do the mods and use Victor traps, apply peanut butter all over a small piece of cardboard and slip it in the V on the plastic tab. This will prevent them from licking it all off and getting away. They eventually will start biting the cardboard and WACK.