Compressor Adapter G14 Female - G18 MaleThis airbrush adapter is mostly used for when you have an airbrush compressor with the larger G1 2 coupler but your airbrush hose has an G1 8 coupler. It also fits our separate airregulator unit and our RUBY spraygun if you want to use an hose with a G1 8 coupler. Note, all our Hobbynox airbrush compressors have the normal smaller G1 8 coupler so it''s not needed with any of them. Male Threads: G1 8 (BSP) fits all of our braided airbrush hoses with a