Experimental data are presented for the phase distribution and junction pressure drops of air-water mixtures (1.5 bar) in two reduced tee junctions. The junctions are horizontal with inlet and run diameters of 38.1 mm i and branch diameters of 19.6 mm i and 7.85 mm i The tested range corresponds to inlet flow regimes of stratified, wavy and annular for both test sections plus slug for the larger-branch test section. Comparisons are made between the present data and existing models of pressure drop and phase distribution, thus identifying the models whose applicability can be extended to the present conditions.