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The 310-54-M3 is designed for exterior installation with a tandem axle air suspension that is controlled by TWO height control valves.
The 310-54-PP is designed for exterior installation with a tandem axle air suspension that is controlled by ONE height control valve.
The 510-30-C is designed for interior installation single axle air suspension that is controlled by ONE height control valve.
The 510-46-C is designed for interior installation tandem axle air suspension that is controlled by ONE height control valve.