Capping a gas line
turn the key, wait a few minutes then smell. if no gas is present, it's doing it's job.
also, look for valves further down the line. cut off as many as possible.
if there are threads at the open end, find matching cap and use appropriate teflon type tape and seal the open end too.
you absolutely want 0% gas coming out.
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to see some of my original magic tricks and trick boxes!