A fluid connector having a longitudinal axis and selective open and closed conditions, the connector only in its closed condition adapted to threadedly engage a mating fluid fitting. The fluid connector includes an elongate conduit member extending along the longitudinal axis, an annular collar disposed about and having axial movement relative to the conduit member between the connector open and closed conditions, and a plurality of split nut members circumferentially distributed about the conduit member and having axial movement relative to the collar between the connector open and closed conditions. The plurality of split nut members and the collar are jointly rotatably about the longitudinal axis, and each split nut member has a distal end defining a threaded nut segment. The split nut member distal ends in the connector closed condition are constrained by the collar against radially separating movement relative to the longitudinal axis and cooperatively define a nut configured to threadedly engage a mating fluid fitting. The split nut member distal ends in the connector open condition have an expanded configuration in which, relative to the connector closed condition, they are radially separated from the longitudinal axis and not cooperatively positioned to threadedly engage a mating fluid fitting.