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Well, that depends on what you're trying to shut off, exactly. If you're referring to the trailer supply and tractor protection valves, the knobs are located on the dash, with the actual valves underneath the dash. If you're talking about a hydraulic cut off for a wet line vehicle, it's usually at the outlet of the hydraulic tank, but if not, it'll be located somewhere between the hydraulic tank outlet and the connecting port for the trailer.

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Q: Where are shut off valves in combination vehicles?
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