seal?
There is no seal in the axle tube or knuckle. The only seals are on the axles themselves (pressing against the spindle) and on the inside edge of the hub.
as far a putting on in the axle tube, the inner seals keep stuff out of the pumpkin. I'm not sure if I want to take the chance of an outer seal trapping water inside the axle tube. Once it goes in, it's not coming out. Where as with no outer seal, it leaks back out.