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The "dump" valves for the front 'bags were mounted together under the cab on the outer driver's side framerail. The 1/4-inch lines that tee off of each 1/2-inch line run to the gauges in the cab. Check the plumbing diagram to get the specifics. And when it comes to plumbing techniques: if there are four people in the room, then there will be four "right ways" to set up your system. My opinion: function over form. Easy access and the least amount of chance of the lines kinking are what I look for in a good install.