Two questions about decanting. Want to end up with the most pressure in the target cylinder. 1) Single to twinset. Should the manifold valve be opened and just decant? or Should the manifold be closed then decant into one side of the twinset, then disconnect and decant into the other side of the twinset, disconnect then open the manifold. 2) Twinset to single Ditto? Further marks for workings!