Originally Posted by Stevemo
This is great information, you have confirmed a few things I was pondering. I think my 2004 Popular 190 has a 14 or 15 psi regulator as it was replaced due to external leakage many years ago.
It seems that I should retain the regulator on my little BBQ and use a non-regulated adapter hose. Is that what you did with your grill?
Most of the information I was able to find on this subject was related to trailers that have a single regulator attached to their replaceable DOT propane tank so it didn't seem applicable to a Class B with built-in ASME tank and multiple regulators.
Many of the bottle grills will not run on the lower pressure, Coleman for one unless they have changed. Our Coleman Fold-N-Go is also not suited as it comes from Coleman. I think it may be because they have a flashback mess in the orifice fitting to prevent flashback fires and that restricts the flow too much.
Your's may actually be 10 psi, as our factory one had a 15psi tag on it, but checked at 10spi, that is why I replaced it, but the new one from Roadtrek was unmarked and tested at 10psi also.
We have a long, 15' hose on ours to the sort of regulator that grills use for the heat control knob. They are a very basic design mainly to help smooth out tank pressure variations. The primary orifice was big enough, but the heat control didn't open far enough for the lower pressure. I got a regulator for one of the other, larger, Magma grilles that was adjustable for range of open with a set screw under the knob that just pushed on the diaphram. Tweaked it until we got the range we wanted for the things we cook. A grille parts store would probably have the same regulator, depending on the grille connection.