Hello,

It is true that the OMS fitting looks a lot like a DIN
fitting.  However on closer examinations it appears to
me that it is in fact the same, but different.  On a
DIN fitting the O-ring is on the end of a male thread
fitting.  This part is the same.  

The difference is in the other end.  A tank din
receptacle is a fixed piece of metal that has the
O-ring contacts and threads all machined (or cast) out
of a single piece of metal.

On an OMS manifold the O-ring contact point and thread
are not the same peice of metal.  This allows for
potenial play in the joint which could result in
potential loss of O-ring contact. An O-ring requires
very little compression to seal, so it does not
require much play to cause problems.

So those are my observations...

My question is.  Is this a real concern? So does this
mean all the OMS manifold bashing I have seen
previously was unfounded?

Mat.

--- Jim Cobb <cobber@ci*.co*> wrote:
> Ah, contention amongst the ranks. A good thing to
> see. Seems to me that 
> the face ring on a DIN is a more robust fitting that
> the leverage the 
> length of the isolator gives you for potential
> misalignment. Jess, I take 
> it you are the team contrairian?
> 
>    Jim
> 
> Sender: Jess Armantrout  Date: 4/9/99 9:58 PM
> 
> >face oring?  You mean like the oring on a din first
> stage?
> >
> >dual captured orings?  You mean like on the usdct
> scooter copies?
> >
> >Trout
> >
> >-----Original Message-----
> >From: Jim Cobb <cobber@ci*.co*>
> >To: Jesse Armantrout <armantrout@wo*.at*.ne*>;
> Elinor Lucas & Matt
> >Abramovich <lucasabramovich@sp*.ca*>; Tech Diver
> <techdiver@aquanaut.com>
> >Date: Friday, April 09, 1999 5:41 PM
> >Subject: Re: WTB: Used OMS iso manifold
> >
> >
> >> To quote your fearless leader the OMS uses a face
> oring rathter than
> >>dual captured orings making them suspectable to
> leakage due to
> >>misalignment or damage.
> >>
> >>   Jim
> >>
> >>Sender: Jesse Armantrout  Date: 4/9/99 2:24 PM
> >>
> >>>My OMS manifold will be the last one I sell.  No,
> I do not have any for
> >>>sale.  I was wondering your reasons why they are
> so bad.
> >>>
> >>>Jess
> >>>
> >>>----------
> >>>> From: Jim Cobb <cobber@ci*.co*>
> >>>> To: Jess Armantrout
> <armantrout@wo*.at*.ne*>; Elinor Lucas & Matt
> >>>Abramovich <lucasabramovich@sp*.ca*>; Tech
> Diver
> ><techdiver@aquanaut.com>
> >>>> Subject: Re: WTB: Used OMS iso manifold
> >>>> Date: Friday, April 09, 1999 1:20 PM
> >>>>
> >>>> What, you do have some for sale? If they are so
> great why sell 'em?
> >>>>
> >>>>    Jim
> >>>>
> >>>> Sender: Jess Armantrout  Date: 4/8/99 11:20 PM
> >>>>
> >>>> >Really?
> >>>> >
> >>>> >Trout
> >>>> >
> >>>> >-----Original Message-----
> >>>> >From: Jim Cobb <cobber@ci*.co*>
> >>>> >To: Elinor Lucas & Matt Abramovich
> <lucasabramovich@sp*.ca*>; Tech
> >>>Diver
> >>>> ><techdiver@aquanaut.com>
> >>>> >Date: Thursday, April 08, 1999 6:55 PM
> >>>> >Subject: Re: WTB: Used OMS iso manifold
> >>>> >
> >>>> >
> >>>> >>You're too late, the garbage man came last
> tuesday. Why would you want
> >>>a
> >>>> >>set of the worse manifolds ever made?
> >>>> >>
> >>>> >>Sender: Elinor Lucas & Matt Abramovich  Date:
> 4/8/99 1:05 PM
> >>>> >>
> >>>> >>>Just wondering if maybe one of you has one
> of these sitting around in
> >>>the
> >>>> >>>garage amidst the 5 sets of
> >>>> >>>doubles, two Gavin scooters, 30 assorted
> stages, Halcyon rebreather,
> >>>two
> >>>> >>>TLS drysuits, 30 regs, 3 Barry Miller
> primary lights, 3 backplates,
> >>>three
> >>>> >>>wings, masks, fins, backup lights, chargers,
> tools, analyzers, etc.,
> >a
> >>>14
> >>>> >>>foot jon
> >>>> >>>boat and motor. ;-)        Hmmm, Trout,
> Joel?
> >>>> >>>
> >>>> >>>Thanks,
> >>>> >>>
> >>>> >>>Matt
> >>>> >>>
> >>>> >>>
> >>>>
>
>>>>>-----------------------------------------------------------------------
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> without my toys!
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