I am not sure on the McMaster parts, but the four CEJN parts that I use are readily available from
John at Northeast Scuba Supply.
1. Standard LP regulator hose to CEJN female quick connect adapter,

shown attached to a 2nd stage hose. The thing I really love about this connector is that it takes a simple one-hand push to connect. I used to fiddle with a standard LP inflater and it was a pain. Plus, the measly orifices of a BC inflater nipple would never be sufficient for a bailout at significant depth.
2. The male CEJN quick connect nipple that fits on the regulator 2nd stage,
shown on LeisurePro's site here. This plugs into #1 above.
3. The 1/4" NPT to CEJN male nipple

is the connector for my off-board diluent (shown) as well as my on-board bailout.
4. The 3/8" O-ring to CEJN nipple can replace the nipple on most LP inflaters,

and is shown here in situ on my Jetsam booster pump, making it boost like a banshee with zero fatalities so far
