Not all BCD hoses fit all inflators?

[johndiver999]

Thanks inquis, I removed the o-rings and they still don't fit!

For everyone, I measured the diameters of the inflator part, I had two inflators that measured 0.312" (5/16") in diameter, these would not accept half of my spare hoses. Then I measured the rest of the inflator parts, they were about 0.004" undersize, these accepted all of the spare hoses.

Who would have thought it is not o rings??? Lol

 

[Eric Sedletzky]

I have a brand new DGX 30# wing that when I hooked up the LP hose it leaked when I cocked it sideways a little. Resting straight on it didn’t leak but bend the connection a little and it leaked.
So I hooked up my old Oxycheq Mach 5 to the same PL hose and no leaks.
So I examined both nipples on the inflator assy and the DGX nipple has much sharper corners where the O-ring would rest on it as opposed to the nipple on the Oxycheq wing was slightly rounded. I checked all my other fittings on other things that use that same male fitting and noticed all of them have a slight radius on that corner.
So the fitting on the DGX wing is faulty. No fault of DGX since they didn’t make it, but I suspect whoever manufactured that generic inflator assembly was using a cheap nipple that is out of spec. Unfortunately a lot of Chinese crap tends to be that way and we are at their mercy.
A lot of times my air fittings in my shop are the same way. Cheap crap from Harbor Freight vs high dollar US made Milton fittings.
The cheap crap a lot of times isn’t even compatible with itself! The male and female fittings right next to each other in the bins don’t even work with each other sometimes!

 

[inquis]

Who would have thought it is not o rings??? Lol

Eh, different sized hardware was my first thought, but the OP said it went part way on. I figured why not try the easy test first. (And yes, I have had the o-ring issue occur and would have sworn it was different HW... but it wasn't.)

 

[LI-er]

I measured the rest of the inflator parts, they were about 0.004" undersize,

I admire your ruler.

 

[rjack321]

Not including combination octo-inflators, there are 3 lpi nipples:

AquaLung/SeaQuest
Scubapro/Tusa
Zeagle/Beuchat

Not positive, but I believe the Scubapro/Tusa is similar to a generic/universal that is on many dry suits and generic inflators...

Apeks had a very large one long ago

 

[arkstorm]

I once had a Poseidon BC and the inflator on it would only work with the hose that it came with.

But that was a long time ago and I haven’t seen this issue come up in the last 20 years.