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This makes zero sense. To get at it in order to gut it you'd have remove it and then reinstall, so what exactly are you gaining? Just replace it while it's out if you need to. Next, if you were to gut it, what now isolates the two channels? You essentially give yourself a single channel braking system by tying all channels back together. I can see if you are replacing all of your lines and say to yourself, boy I'd really like to look at my combination valve rather than it be out of site.