airbrush not spraying with needle cap off?

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Brand : HobbyMio, Type : Universal Airbrush Needle Cap, Suitable for Airbrush threads with a diameter between 3.7-3.9mm., Effectively protect the

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High quality stainless steel needles and pure copper airbrush nozzles & Nozzle Caps. Comes with 0.2mm, 0.3mm,0.4mm, 0.5mm Airbrush Needles, airbrush

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