Yes. Not every promo item manufacturer is savvy enough, but if you ask you will usually get a solid answer from them.
Incidentally, if they can't give you a satisfactory "Yes or No" answer you might not want to deal with them. If they don't know about PMS, even if they don't use it themselves, they might be trouble.
I have found that the level of knowledge of promo manufacturers and promo printers ranges very widely from Ignorant-and-new to Knows-better-than-I-do.