>The thread protectors need not have any more warning on them than the plastic thread protectors
Well, I don't know. But I'm not sure that I have seen one. The ones I've seen and used on black steel (2" and under) were very substantial and appeared indentical to couplers purchased off the shelf. Perhaps not all manufacturers use dummies?
> I can't see how any installation could be speeded up by having a coupling on the end installed by the factory, as you'd need to pull it off anyway to apply joint compound.
That's a good point if being used for gas.
But I should say that it assures that you have the correct number of couplers on hand.
Anyway, if they are unmarked, how are they distinguished from real couplers?
