A sub-sea connector for connecting to another sub-sea connector to form a sub-sea coupling, the sub-sea connector comprising: a plate having a front side configured to oppose a front side of the other sub-sea connector when forming the sub-sea coupling, a rear side opposite the front side, and an opening extending through the plate from the rear side to the front side; at least one coupler having a forward end configured for mating with at least one corresponding coupler of the other sub-sea connector, and having an opposite rearward end configured for connection to a conduit, the at least one coupler being insertable through the opening from the rear side of the plate such that the forward end of the coupler corresponds with the front side of the plate and the rearward end of the coupler corresponds with the rear side of the plate, the coupler having: a body extending along a longitudinal axis, the body having an abutment that engages the rear side of the plate when the coupler is fully inserted through the opening in the plate from the rear side of the plate; and a radially inwardly extending groove longitudinally spaced apart from the abutment; and a mounting ring at least partially disposed in the groove and configured to engage an abutment surface at the front side of the plate for restricting rearward movement of the body; wherein the groove is longitudinally spaced apart from the abutment such that, when the abutment is engaged with the rear side of the plate, the groove is positioned forwardly of the front side of the plate sufficiently to allow a radially inward portion of the mounting ring to be inserted into the groove with a radially outward portion protruding radially outwardly from the body so as to engage the abutment surface at the front side of the plate for restricting rearward axial movement of the body relative to the plate. a plate having a front side configured to oppose a front side of the other sub-sea connector when forming the sub-sea coupling, a rear side opposite the front side, and an opening extending through the plate from the rear side to the front side; at least one coupler having a forward end configured for mating with at least one corresponding coupler of the other sub-sea connector, and having an opposite rearward end configured for connection to a conduit, the at least one coupler being insertable through the opening from the rear side of the plate such that the forward end of the coupler corresponds with the front side of the plate and the rearward end of the coupler corresponds with the rear side of the plate, the coupler having: a body extending along a longitudinal axis, the body having an abutment that engages the rear side of the plate when the coupler is fully inserted through the opening in the plate from the rear side of the plate; and a radially inwardly extending groove longitudinally spaced apart from the abutment; and a body extending along a longitudinal axis, the body having an abutment that engages the rear side of the plate when the coupler is fully inserted through the opening in the plate from the rear side of the plate; and a radially inwardly extending groove longitudinally spaced apart from the abutment; and a mounting ring at least partially disposed in the groove and configured to engage an abutment surface at the front side of the plate for restricting rearward movement of the body; wherein the groove is longitudinally spaced apart from the abutment such that, when the abutment is engaged with the rear side of the plate, the groove is positioned forwardly of the front side of the plate sufficiently to allow a radially inward portion of the mounting ring to be inserted into the groove with a radially outward portion protruding radially outwardly from the body so as to engage the abutment surface at the front side of the plate for restricting rearward axial movement of the body relative to the plate.