The present work reports a study of phase split at a horizontal T-junction with main and side branches of 0.005 m diameters. The experiments were confined to the stratified flow pattern and the effects of phase velocities and pressure on the split were examined. The results were also compared with those reported for larger T-junctions. The side arm take-off tends to be richer in the gas phase with increase in pressure under all flow conditions. The reason has been attributed to the complex effect of pressure on the interface position (characterised by the dimensionless liquid height, h/D) which in turn determines the gas and liquid momentum. (c) 2005 Elsevier Ltd. All rights reserved.