Filling an iKegger from a KegSwappa keg

Want something more portable than a 20L keg? Want to fit it in the fridge at home or take it with you and have it stay cold all day in an insulated iKegger? Here's how to fill it quickly and easily.

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Alternative to this wobbly valve: measure once with water how large the volume of the small barrel actually is. To simplify, assume that beer weighs as much as water. Then place the small barrel on the scale and stop the transfer when the weight is reached.