Realizing high quality paint film by optimum spraying paint volume. Stable air flow vastly realizes the prevention of air pressure lost. Reduction of paint consumption, and small air consumption in saving energy. Optimum air flow brings the reduction of paint adhesion to air cap set. Easy handling with optimum weight balance and light weight. Reduction of trigger load, and improvement of usability with lower resistance packing. Waterborne compatibility. Improvement of parts durability. Addition of Semi-tulip pattern. Each nozzle bore size has its own air cap set. Air cap sets for suction, gravity, and pressure type are interchangeable in the same fluid nozzle bore size.