Why do you need T slot outlets for 20A split receptable outlets?

Amazon has ivory t-slot duplex receptacles Save Share Like Only the receptacle is 15 amp and that is okay to do if it's a duplex receptacle

HUBBELL HBL5461 AC Receptacle NEMA 6-1520 Female Industrial Grade - Electric Plugs

titanic slot machine heart of the ocean The T-shaped slot indicates that the 120-volt receptacle is rated for 20-amps Regular wall receptacles with a pair of vertical slots are

the avengers slot T on that one slot Now a 20a 220v plug will have the other A 20a receptacle has the t slot so you can run a 15a wired device