Beware of youtube videos about connecting 2 compressors together

Bill Crowell said

Del, thanks for the reply. When the picture was taken I was working on the system and some stuff was disconnected.

For the life of me I am not understanding why you say I need to use two check valves. I'm just using one, and it seems to work, but of course maybe I am overlooking something. I sure would appreciate it if you would explain that.

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As I said I cannot really see your photo, and it depends on the unloader. But since you are cutting power at same time, and "I guess"? the pump outputs are connected together, this means either/ both or just one unloader should drain both heads. If that is the case then just one check into the tank would do. So main issue I see is the rigid pipe. Don't use hose, but you need something for vibration/ heat expansion which is an issue. "Usual" solution is a coil or U bend of copper tube (or aluminum on smaller stuff)