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TJK-1 / The Job Knob , Magnetic Acetylene Tank Knob! Features: Magnetic , removable MC Tank Knob , Fits MC Tanks , & Made in the U.S.A. Many acetylene tanks do not come with a mechanism on the valve to open them, only a metal shank. The Job Knob offers the user the ability to open and close the valve with ease without jeopardizing the integrity of the shank. The Job Knob magnetically stays with the tank in use until the time of exchange where it can easily slide on the new tank valve. Need Help Identifying the Correct Component...Contact AirstarSupply!