Here we go........
There have been past threads on euthanizing rats correctly. They got a little heated/emotional.
The two most preferable ways are cervical dislocation and the gas chamber with CO2.
Cervical dislocation is pretty "hands on". You hold the rat's head firmly in one hand and with the other hand grab the base of the tail and a quick yank. This should snap the neck immediately. If not, then you are being pretty cruel to the rat learning your trade.
You can easily build a gas chamber with an ice chest, plastic bowl with lid with holes, dry ice, and a glass of water.
However, there is no control of the gas. If released too quickly can cause panic and stress to the rats as they die.
The best? A gas chamber made with a CO2 tank bought at Walmart in sporting goods. Get tubing and a control valve where you control the rate of gas being released into the chamber. This allows the rats to fall asleep so to speak before they ingest more gas and die.
Older threads show you how to make the chamber. And I'm sure YouTube is your friend.
Best
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