For anyone this may help. I spent a lot of time reviewing specs and then confirmed with tech support at Marshall Excelsior:
Item 1: As opposed to what you find wind all over the inter webs, The MEGR-295H is NOT the direct replacement for the OEM regulator in a 2006 Diplomat. Several of the Marshall Excelsior MEGR family of dual stage regulators share the same regulator body, but the EXACT replacement for the OEM regulator is the MEGR-298H (as Jim says above) which does NOT contain the excess flow prevention device. On Dips (or any other coach with a Manchester LP tank), the excess flow