Sealed connectors, such as the Econoseal, have rubber seals around each wire entry and a body seal, where the male and female halves join.
You can see the Orange body seal in the Econoseal connectors on the left of this picture (and the Blue body seal on the JPT connectors on the right) -
and the wire seals around the cables -
Green on the Econoseal -
and White on the JPT -
The Econoseal terminals are crimped like this -
.
