I see alot of people reference QF as QF 4.0. Is it safe to assume that there's a QF 3.0 (and below) out there?

Just thought I would check as I am ordering some QF to keep on hand in case of an emergency.

Thanks so much!
mrgoodm Reviewed by mrgoodm on . QF and QF 4.0 I see alot of people reference QF as QF 4.0. Is it safe to assume that there's a QF 3.0 (and below) out there? Just thought I would check as I am ordering some QF to keep on hand in case of an emergency. Thanks so much! Rating: 5