A 3/4 inch corrugated hose will actually fit on an AIR 2 with very hot water, a little soap for lubricating, and the appropriate language. If you cannot find the appropriate words to make that work there is a special corrugated hose that has a 1 inch diameter on one end and 3/4 on the other.
Backplate and Wings - Wings/BC Parts - Corrugated Hoses - Elbows - Quick Dumps - 12'' Corrugated Adapter Hose - Northeast Scuba Supply
If you buy a new AIR 2, it will come with the correct inflator hose. If you purchase a used one and it doesn't come with the inflator hose IMHO the best method of connecting an inflator or inflator/regulator to your first stage is with a standard second stage (or Miflex or Phantom) hose coupled with a screw on adapter. There are a few advantages in doing it this way. For one thing l/p second stage hoses come in a large variety of lengths making routing much simpler. Additionally, if the hose becomes defective one only needs to change it out. See the link below for an online supplier of adapters.
HP, LP & BC Hose Adapters and Fittings - Dive Gear Express
Backplate and Wings - Wings/BC Parts - Corrugated Hoses - Elbows - Quick Dumps - 12'' Corrugated Adapter Hose - Northeast Scuba Supply
If you buy a new AIR 2, it will come with the correct inflator hose. If you purchase a used one and it doesn't come with the inflator hose IMHO the best method of connecting an inflator or inflator/regulator to your first stage is with a standard second stage (or Miflex or Phantom) hose coupled with a screw on adapter. There are a few advantages in doing it this way. For one thing l/p second stage hoses come in a large variety of lengths making routing much simpler. Additionally, if the hose becomes defective one only needs to change it out. See the link below for an online supplier of adapters.
HP, LP & BC Hose Adapters and Fittings - Dive Gear Express
