PV-Cables Multi-Contact MC4 Connector Female, 4mm Multi-Contact MC4 Connector with Boot for 3 to 6mm OD #10 AWG USE-2 Female (+) 32.0014P0001-UR Male or Female? At first glance, the distinction between male and female connectors is somewhat counter-intuitive. "Male" or "female" refers to the metal pins within the connectors rather than the actual plastic housing of the connectors. The housing of the male connector has a large opening at the end with the actual pin inside. The connector of the female pin, however, has a long tip goes fits into male connector when the two are mated. If you have any questions before you make a purchase, give us a call so we can help you understand the difference between the two!