At 04:47 PM 7/20/2008, Todd P Last wrote:
>Why the 290 and not the 299?
>The 299 looks like it is a 290 designed for horizontal mounting.
>(e.g. vent points down.)
>
><http://www.dyersonline.com/Products/Marshall-299-Integral-Two-Stage-Regulator__66-8723.aspx>

290, 294, 299 -- should all be good.  294 has the "excess-flow" POL
fitting already installed (means that if there *is* too much flow
because the regulator has broken off in an accident, the fitting will
internally shut down and stifle it.  Required on RVs for obvious
reasons).  290 and 294 need a plastic snap-on cover to protect the
vent, 299 does not.  Purpose of the vent is to provide
atmospheric-pressure reference for the second-stage
regulator.  First-stage regulator has a pinhole in the cover for same purpose.

--
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage," '85 GL "Poor Relation"