Experiments demonstrate that a small steplike change in diameter placed near the or ice inlet has noticeable effects on the droplet size distribution in the resulting spray. Additionally, the driving pressure required to produce hydraulic flip is increased substantially, allowing greater mass flow through a given diameter or ice. Measurements show that the streamwise extent of the cavitation at the inlet is substantially reduced by this step, leading to the increased operating pressure range. The fluid mechanisms creating the performance changes need to be investigated.