Can i connect the DeVilbiss iGo to a CPAP machine?

Yes you can but only if it's set to continuous flow mode at no more than 3lpm. The DeVilbiss iGo is capable of both pulse dose mode and continuous flow so make sure the mode the mode is set correctly when connnecting it to a CPAP or BiPAP machine. All home concentrators are continuous mode but only some portable oxygen concentrators such as this one are continuous mode capable.