Experimental data are presented for the phase distribution and junction pressure drops of low-pressure (1.5 bar) air-water mixtures at a horizontal, equal-sided (37.6 mm i.d.) dividing tee junction. These data correspond to inlet flow regimes of stratified, wavy, slug and annular flow with inlet superficial liquid velocities J(Ll) < 0.2 m/s, for which very limited pressure-drop information is currently available. The phase-distribution data are shown to be in good agreement with data and models available in the literature. Comparisons are made between the present pressure-drop data and existing models, thus identifying the models whose applicability can be extended to the present limiting conditions.