The COMBO/DISTRO has an NL4 that sends Pin 1+,1- to Pin 1+,1- on an NL4 and a parallel connected NL2/Combo connector. Then Pin 2+,2- is sent to Pin 1+,1- on an NL4 and a parallel connected NL2/Combo connector. Essentially a “Y” connection to each set of contacts on an NL4 connector.