Paul, the answer to this depends both on the first stages you are
using, how they are oriented, and the tank orifice offset from the
centerline (LP steels which are 8 inches need a slightly longer hose
than 80's which are 7.25 inch diameter).  Basically, you want it to be
long enough to enable you to turn your head throough your normal range
of motion to the left.  If it's pulling at your mouth, go longer.  The
extra inch or so really isn't so much of a safety concern.  Using LP
steels and a ScubaPro MK 20, positioned with the end port inward and
angled down about 40 degrees, I use a 24 inch hose on the end port, and
probably could use 25.  Don't add swivels or elbows.

-Sean


On Sat, 13 Nov 1999 13:43:13 -0000, Paul Harris wrote:

> Another thing for the FAQ, but I need one so can't wait :-)
>
>What is the correct length for the backup reg hose.
>On my Cave I with JJ he said my 'Normal' length hose was 
>'marginal'. :-)
>It is now time to replace it.
>The is a standtard one an inch or so shorter at 2 ft., but 
>this still hangs over my
>right shoulder.
>
>I can get an 18" one, but I think that this might be a bit 
>tight when looking 
>fully left.  This is mainly due to the way the hose comes out 
>of the reg.
>
>I have seen 120 degree adaptors - not swivels -that may 
>alleviate the problem, but this adds 
>an o-ring.
>
>There is of course no problem when looging right, or behind 
>me by looking down my body.
>
>The hose George has on the DIR II tape seems to be about 18" as far 
>as I can tell i.e. it does not seem to reach the base of the cylinders. 
> 
>r
>Paul
> 
>
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