Disclosed is a system for transporting fluid, including a first vessel and a second vessel, the system including: a split volume tank comprising a first volume and a second volume, wherein when one of the volumes expands the other volume collapses; and a four way valve fluidly connecting the first and second volumes and first vessel and the second vessel, the four way valve comprising a plurality of passages including a first passage and a second passage, the four way valve being controllable between a plurality of orientations including: a first orientation in which the first passage fluidly connects the first volume and the first vessel and the second passage fluidly connects the second volume and the second vessel; a second orientation in which the first passage fluidly connects the first volume and the second vessel and the second passage fluidly connects the second volume and the first vessel.