Hubbell has what you want, and from various sources.

https://www.zoro.com/hubbell-wiring-...gcls rc=aw.ds for the male end.

https://www.zoro.com/hubbell-wiring-...9c/i/G2032852/

for the female.

If this is what you want, search the various suppliers directly and then contact your local electrical supply house. They will sell these devices to 'civilians' around $10 or so, each.

Avoid the likes of Harbor Freight or other Chinese Junque outlets like the plague that they are.

Peter Wieck
Melrose Park, PA