The basics Iwata Big Mouth Airbrush Bottle 3 oz / 84 ml Jar with 38 mm adaptor cap. The benefits This is a durable, graduated jar with a large opening for pouring and mixing paint. The uses Solvent-proof for all airbrush paint mediums. The bottom line The domed, high-strength one piece adaptor cap with offset friction fit connector easily affixes onto your airbrush. It's raised air intake creates a splash-proof opening. The detachable pick up tube makes this an easy to clean cap.