Xantrex 6048 inverter/charger 2015-2026 vintage

The aux port on the bottom of the inverter is a 5 pin block female. Does anyone know what the pitch size is for this connector? I tried a 3.81 mm. It looks like it should fit but does not want to go in. I know there are 3.5mm etc, other close sizes. The correct size would be appreciated...
Thanks in advance...
.....Bill