I am trying to change my 21 year old outlet to a new USB paired outlet. There are 3 hot, 3 neutral, and one ground on the existing outlet. The new outlet does not have spring holes, and only has the 3 standard screw connections. What do I do with the extra wires?
Twist the three white wires together, along with a short (about 6") length of the same gauge white wire (often called a pigtail), and cap with a wire nut. Or use one of the new push connectors.
Similarly twist the black together with a short black.
Attach the new short wires to their respective terminals, and reattach the ground wire.
All should be well.