I want to add an outlet in the middle of a run in my kitchen. The start of the run has a GFCI outlet. The outlet I want to extend off of is a regular 15amp with both line and load connections used (2 hot, 2 neutral, pigtailed ground). The outlets all run off a 20amp breaker.
Assuming there is room to add another 12/2 line into the box how should I connect it to the existing outlet without affecting everything downstream?
Thanks!