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Originally Posted by Cosmo
I know Carlisle has that "optimizer" for adding compressed air, but I don't know anyone that uses it so I don't know much about it. Don't Herbert Arnold torches use compressed air as well?
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Yes, HAs use compressed air.
When using compressed air with a Herbie, be sure to have a water trap in place. It can be an expensive mistake not to (there was a thread about it on the GLDG).
For other torches without the dedicated inlet, you just add air through the propane line. This works well for four stud torches. It is important to have an in-line regulator for the air. Jason Howard used to make these set-ups, and may again if he is persuaded to with enough interest.