This plug is to ensure all the propane from a Coleman propane tank is evacuated. I did this so I could dispose the cylinder without it being a hazard to sanitation workers. Make sure that directions on the side of the canister are followed before using this plug. I printed mine on .3mm layers, but feel free to do what you like. I will make the disclaimer that to use this follow the instructions on the canisters about letting the propane device use up all the propane before using this plug.