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There are a hassle to find the awl or something to drilled the hole butane gas can to deflate the remaining gas.
This one is a package product designed to solve all at once.
Because it is attached sharp needle, so it does not have to do find the awl.
In addition, there is no discomfort when using usual because the small size located on the underside of butane gas.
Pull the handle sticks to the bottom of butane gas cylinders, and deflate the remaining gas.
Daegu Catholic University
Daegu, South Korea