To add to this, here is a warning I posted on the Yesterdays Tractor Tool discussion group, about a defective MAPP gas cylinder I came across.
I bought a clear plastic package (one of those that you have to cut up to get open) at Home Depot, it was a Bernzomatic TS4000 torch, a MAPP gas cylinder and a freebie pair of vice grips. Good deal, reg $39 on sale table for $29. Others on the shelf still priced at $39. The torch alone sells for $39 also. Anyhow, I get it home, and after messing with it, couldn't get the cylinder to screw on the torch, finally discovered the cylinder had LEFT HAND threads!!!!!!!!. Standard MAPP and Propane cylinders have Right Hand thread, while the Bernzomatic Oxygen cylinders have Left Hand thread. I have one of their MAPP/O2 torch on a hose setups, so I know the difference.
I tried the Mapp cylinder from the other rig and it screwed right on the TS4000 torch. Then I tried the defective MAPP cylinder on the O2 regulator of the other torch setup I have and it screwed right on. The defective cylinder is painted yellow, and labeled as a MAPP gas cylinder and is filled with MAPP gas, just the wrong thread.
I emailed Bernzomatic, they didn't seem to care much, take it back and swap it out was the email I got. I asked if there was a recall or if this was a known problem but got no answer to that.
If you find one of these good deals, the torch alone is a deal for $29 as it is heavy aluminum and works upside down and also runs propane (according to this package, but not according to other packages also containing the same TS4000, Bernzomatic couldn't answer why the difference in labeling, some Mapp only, some Mapp/Propane for same part)
Just wanted to warn everyone.
Charles
Click on the thumbnail to enlarge it.