240 20 amp socket

[theoldwizard1]

Just buy a dog bone electrical connecter.

https://www.amazon.com/dp/B06WRT9LLP/?tag=atomicindus08-20

I made my own !

 

[sberry]

I applaud you for trying to work with and be helpful to your contractor. A good hand will recognize this.
What exception am I missing that would allow UL listing of that adapter??