What does GFCI t-slot do?

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

T-shaped prong on one of the top vertical slots You'll often find Like GFCI outlets, AFCI outlets should be labeled at the bottom of the

toto12 slot Right: T-slot duplex socket The parallel and tandem socket accepts normal parallel NEMA 1‐15 plugs and also tandem NEMA 2‐15 plugs Both

tiki runner 2 doublemax slot receptacles having both configurations of slots and others having T slots ^ Leviton Duplex Receptacle, T-SLOT, not UL listed; for Replacement use