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[Yorick]

Heres my method. We rent a co2 tank from a welding shop for paintball and we have used it on occasion to kill unwanted rodents for snake food. If i remember right, you put 135 down to rent the tank and then like another 145 to rent it for 20 years. You get the 135 back when you return it. It costs like 15 dollars to refill the tank and between paintball and other uses, only refill it like twice a year. Definatly a good investment if you plan on killing rats all the time. As you can see, the adapter on the tank is used for paintball, so i just wear a glove and hold the tubing to the hole. Its better than buying another adapted and it gets the job done. the tub isnt air tight which i find is better becasue it lets the oxygen out and keeps in the co2.