Iwata Big Mouth Airbrush Bottles 4 oz Cylinder with 38mm adapter cap is solvent-proof for all airbrush paint mediums. This is a durable, graduated cylinder with a large opening for pouring and mixing paint. The domed, high-strength one piece adapter 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.