Those three regulators are all very similar and essentially do the same thing but they're used on different propane setups.
Part # 37207-30365 is a vertical regulator. Vertical regulators are commonly on propane systems on travel trailers or pop up trailers
Part # 37207-30375 is a horizontal regulator that also has POL fitting inserted into it. Horizontal regulators are usually what you see on motorhome systems. The tanks on motorhomes, called ASME tanks, also use a POL connection like... view full answer...
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