Thats how they fill mine. I take off the top and they just drop a hose into it and away it goes.
Like was said before, mine is a low pressure Dewar so when its full I generally have to let it sit over night before I can start getting a good flow of liquid out of it. I have seen a way to pressure the tank tho., but it requires a few fitting and a tank of LN gas to do it.
My 50L has never vented, but the 160L's low pressure Dewars I have had vented a lot. 230L high pressure one vented very little.
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