ParkPower 15A, 20A, 30A & 50A Power Inlets

what size hole do you need to cut? how far apart are the mounting screw holes (center to center)?

I have noticed a few reviews saying the cap won't stay in place. Has anybody identified a way to make the cap stay in place?

How is the inside configured meaning is there a female receptical for a plug inside the trailer

Can this be used on a home as a generator inlet?