Smittybilt Air Compressor Mod! 

They don’t make an adapter that goes from nitto japanese to standard American?

Should put the spring back up there. It is to stop the plastic from bending also

That's the compressor's overpressure relief value popping off, which lets you know your setup is incorrect. Air needs to flow continuously while the compressor is on, otherwise the relief valve will pop like yours is. The relief valve is there for safety.