Once you remove the sheet metal covering the underside of the unit you will find the valve easy to change out. Yes there are two sizes the smaller one if for the grey tanks while the larger for the black. You may want to think about changing to direct pull instead of the cable. I know on my cardinal I have three direct pulls they dilled a hole through the frame for the rods. When its time to replace the valves I will be leaving the old in (open) and installing the new in a spot open and easier to do maintance on.
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3500 Ram 5.9l diesel
08 35 RLT Cardinal
5th Airborne Pin Box
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