airbrush not spraying with needle cap off?

Needle end caps

Painting with cap on or off : r/airbrush

High quality stainless steel needles and pure copper airbrush nozzles. Comes with 3PCS 0.4mm Airbrush Needles and airbrush nozzles ;Needle Length

Uouteo 3PCS 0.4mm Airbrush Nozzle and Airbrush Needles Replacement Parts for Airbrush Spray Gun

Airbrush Not Spraying Paint

Airbrush Cleaning Kit, Airbrush Nozzle Cap Kit and Airbrush Needle

Hingst's Sign Post: Cleaning Your Airbrush

Introduction To Airbrush – Chef Rubber –

Airbrush Needle Nozzle & Nozzle Cap 0.2-0.5mm F Airbrushes Spray

Airbrush FAQs – Genie's Products

Airbrush Cover Cap Universal Replacement Parts

How to Clean and Troubleshoot Your Airbrush Gun — The Cookie Countess

How to Clean and Troubleshoot Your Airbrush Gun — The Cookie Countess

1.100% brand new and high quality 2.Superior stainless steel, durable and stable 3.Suitable for professional airbrush sprayer, easy to install

HUBEST 0.2mm, 0.3mm, 0.5mm Airbrush Nozzle Airbrush Needle Nozzle Cap Replacement Parts for AB-180 AB-181 AB-181A Airbrushes

Noob question: why does this part of my needle always get gunked

Nozzle Caps Paint Sprayer Airbrush Sprayer Nozzle Tips Airbrush