Here is my Co2 Chamber!
It will fit any rodent!
supplies
1. Bucket with lid-DONT USE OLD PAINT BUCKET! CLEAN OUT BUCKET!
2. Foam cooler
3. Tubing
4. Dry Ice once your ready to use.
Step one
Take bucket and drill hole on side for tubing.

Step two
Drill hole in lid

Step three
Insert tubing and use bathroom multiple use cocking around the the hole where tubing is.

Step four
put a hole in side of the foam cooler and insert the other end of the tubing.

Let the glue settle over night, and there you go!

You might want to put a phone book on top of the foam box.
Directions
put dry ice in the foam cooler, spray some water on the the dry ice to make the co2 start coming off.
Put the rats of whatever in the bucket and put on lid, give it 10 mins and you should have some ready to freeze rats!
Here is a LARGE MALE rat

here is him and two prego females

And this is from them being in there for 1 minute lol,

So I suggest to put down some newspaper.
Hope you guys found this usefull!