The Grex Airbrush Adapters allow you to use a variety of different hoses and compressors. Each adapter specifies the size and type of fittings. The AD6 and AD11 have similar fittings, but the AD6 requires a wrench to tighten, while the AD11 may be turned by hand.
Grex AD28 Airbrush to Paasche Hose Adapter
Iwata Airbrush Adaptor for Paasche Brand Air Hose: Anest Iwata-Medea, Inc.
Adapters Paasche Airbrush Company
Paasche Hoses and Accessories
Paasche Hoses and Accessories
Paasche Airbrush Airbrush Adapter, Silver : Arts, Crafts & Sewing
Badger airbrush adapter to 1/8 hose 36-010
Grex Airbrush Products - HobbyTown
Grex Airbrush - G-FLX.25 - 25' ULTRA-FLEX® Airbrush Hose
Grex Airbrush - G-FLX.10 - 10' ULTRA-FLEX® Airbrush Hose
Paasche adapter to 1/8 BSP - SprayGunner