The Airsoft Innovations Duster Adapter.

• Power your GBB with widely available computer duster gas
• Completely re-useable
• High visibility red makes it easier to find
• Easy to inject silicone oil to your mags
  drip two drops of oil into the duster can tip before attaching the adaptor
• Soft sealing plastic tip doesn't mar brass magazine fill valves
• Also compatible with the AI Propane Adaptor.
  Use it as a 1" extension tip for certain magazines needing exceptionally long filling probes.