I'm a bit confused. The title of your post says "5v p
v" (i.e., personal vaporizer), yet the body of your post uses "p
t" (i.e., pass
through) twice.
If you are talking about 5V
personal vaporizers, there aren't too many. The best known is the $70
Puresmoker Prodigy V2. NHaler's $75
XHALER works at many voltages, including 5V. [Neither price includes
batteries or charger, available separately.]
BTW, another direction to go would be a
6V Mod used with a "high voltage atomizer" that recently has appeared on the scene.
As I understand it (notice that emphasis; I'm quite non-technical), these HV attys have a higher resistance, bringing the effective
power of the device down to around what a 5V Mod with regular atty would yield. I know you can get such HV atomizers (801, 901, or 510) from
NHaler and
Eastmall, probably other places as well. There are
many (excellent) 6V Mods; each has loyal fans. Some of the best known are Chuck and Silver Bullet (both Vapy Award winners), as well as GG Transformer, Copper, AdapteveR, Super-Six, and the already-mentioned XHALER.
The two premier 5V USB
passthroughs I know of (from U.S. suppliers) are the $80
VP Passthrough and the $70
Puresmoker Manual USBpass V2. They each come with the adapter of your choice, including 510. Of course, at those prices, they better be "premier." [From what I've read, they are.]