I don't know about putting that hard pipe in.. there is a reason that every manufacture puts it on a rubber hose. I THINK you will find that the way it is set up acts like a shock absorber for the regulator.
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
140 days boondocking in 2016
211/2015, 196/14, 247/13, 193/12