In theory all USB runs on 5 volts, but the power supplies do vary a bit. I narrowed it down to two likely ones:
Ktec: 5v, 2amps
Deer: 4.0-5.5v, 2.4amps
Likely either one would work, but I'd prefer to use the one that came with the hub. I could not find any photo of the hub with its power supply and SIIG could not tell me what it came with.