The attached Iwata airbrush fitting and 1/4 in compressor fitting use O-rings which form leak-proof seals when attached.
Iwata-Medea Air Hose : Tools & Home Improvement
Iwata Braided Nylon Air Hose with Two 1/4 Fittings - 10ft – Opus
Iwata 10' Cobra Coil Airbrush Hose with Iwata Airbrush Fitting and
Iwata Hoses, Manifolds & Connectors
Fits Iwata, Devilbiss and Master Airbrush Brands, as well as many other popular brands Genuine Master Airbrush Brand Quality Hose Connections: Both
Master Airbrush Premium 10 Foot Nylon Braided Airbrush Hose with Standard 1/8 Size Fittings on Both Ends (Hose color may vary)
Iwata Hoses, Manifolds & Connectors
6' Airbrush Hose 1/8 X 1/8 End Iwata Thread Both Ends — TCP Global
Iwata 3 Metre Braided Airbrush Hose
Iwata 20' Braided Nylon Covered Airbrush Hose with Iwata Airbrush Fitt
10' BRAIDED AIRBRUSH HOSE 1/8 Fitting Ends Coupling Fit Iwata
Iwata Braided Air Hose - 10', Hobby Lobby
Iwata Hoses, Manifolds & Connectors