I'm the OP. I totally get that it looks proprietary, the problem is I don't believe it. I have a brother-in-law that is a die and tool guy. They are the men/women that make the molds that make the plastic pieces for things like this power plug. I have learned from him how VERY expensive to make a mo...

My wife just got a Resmed 11 CPAP machine with that square plug. I would like to build my own DC power cord, the only issue is I don't want to spend $30 for the cable, I am sure the connector can be sourced for far less, if I know what the connector is called. Anyone know?