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IMO the best method of connecting an inflator or inflator/regulator to your first stage is with a standard second stage (or Miflex) hose coupled with a screw on adapter with a quick disconnect. There are a few advantages to 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 hoses and adapters.
fwiw there are three sizes that most inflators or inflator/regulator usually fall into:
1) The "standard" <--- most inflators
2) Oceanic Air XS, Aeris Air Link, SeaQuest Air Source, Apeks Octo Plus, Zeagle Octo Plus, US Divers Air Mic.
3) Tusa DuoAir, ScubaPro Air 2, Atomic SS1.
see this link: Discount Scuba Gear at DiveSports.com - Buy Scuba Diving Equipment & Snorkeling Equipment
Here is a link to a similar thread: See post #9 where TFSails give a great explanation.
http://www.scubaboard.com/forums/ta...er-valve-wont-connect-my-bcd.html#post4363990