Thank you for your inquiry to Electric Generators Direct!
The Power Inlet Boxes and Transfer Switches are fitted with recessed, twist lock connections. While your electrician has referred to this as a female, it is very likely that it is the L14-30R receptacle type. This cord would be the recommended connection from your generator to any of our power inlet boxes, or transfer switches.
I have provided you with a link to clarify the configuration of the L14-30R.
PB30