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A stem forged from brass to make an outlet channel for the gas cylinder through a stem that connects to the regulator. The thickness and thread is produced per specification for each individual regulator. The inlet stem is a certain length, depending on the gas used and has a bull nose at one end which fits into the cylinder outlet and is tightened with a bull nose nut of the same thread. The stem also has a metal mesh gauze at the one end to assist in the prevention of any unwanted material from entering the regulator. The other end is has a die cut thread that would correspond to the particular gas it is being used for.
These Bull Nose Stems are available in a variety of sizes & lengths.