Fenix is declared, and really is waterproof (IP x8) as it comes out of the box, ultafire as come from factory is absolutely not waterproof.
However, if you manage to unscrwìew the two part of the head, (they are glued together but the glue is not too strong) and reassemble sealing the lents to the top ring and the threads between the top ring and the head bottom, that contains the pill, you get a perfectly waterproof head.
Now, remiove the two orings, put two or thre turns of plumber teflon tape in the oring groove, replace the orings (one is enough) and you got a perfectly waterproof Ultrafie E05, much berìtter then Fhenix, once waterproofed.
I wonder why they do not do this at the factory.