Many electricians don't like to use "back-stab" or push-in connectors in receptacles, and prefer to use the screw terminals -- see, e.g., https://diy.stackexcha

Many electricians don't like to use "back-stab" or push-in connectors in receptacles, and prefer to use the screw terminals -- see, e.g., https://diy.stackexchange.com/questions/7977/when-to-use-holes-instead-of-side-terminals-to-wire-an-outlet https://diy.stackexchange.com/questions/7977/when-to-use-hol...