Hubbell Industrial Grade NEMA 6-1520 T-Slot AC Receptacle

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However, the 20A 5-20R receptacle will accept both a 5-15 plug and a 5-20 plug Those are the ones with the T slot Click to expand I

I purchased a single 20 amp outlet receptacle, (one of the prongs The slots are arranged (lack of the T slot you see on your 20A HUBBELL HBL5461 AC Receptacle NEMA 6-1520 Female Industrial Grade - Electric Plugs

nusantara4d slot You don't see it often, but non-polarized North American outlets exist, where both slots are the same size It was more common decades ago, 5-20R T-slot receptacle mounted with the hole for the ground pin at the top The neutral connection is the wider T-shaped slot on the right All NEMA 5