I am working on a hitachi ec12 it uses a condor switch mdr21 120psi, I attemted to intsall a condor switch provided by Campbell Hausfeld mdr21 120psi all the numbers are the same although the unloader valves are different. when the switch shut off the unloader is popping open bleeding air. THIS IS NOT A CHECK VALVE PROBLEM as I have checked it already. I removed the unloader valves and they are spring loaded in different directions from one switch to the other and they are not interchangable. As the swithes have the same numbers how do you figure which switch to use or can you only use the switches Supplied by Hitachi. In advance Thank you
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