[hypoxia]

I go to FleetPride and get DOT fittings for $2.  Bomgaar's  is about that for regular compression fittings.  I don't think it matters what you use as long as you put a sleeve in the tubing.  I'm replacing as many elbows as I can with Street Ell's and straight compression fittings.  A straight fitting can usually be replaced without removing the part.  If you can buy a replacement valve with the same brand & part number there may be no need to replace the valve body since the wear item is in the stem, just replace the stem.  That makes for a quick easy repair.  I'm currently replacing entire valves just to get rid of those leaky push connect fittings but while travelling I just replace the stem.

One problem with DOT fittings is the built in sleeve.  If you get to the point where you cannot remove the hose from the sleeve you have to cut/file the olive off or the entire fitting must be removed while a non DOT fitting has a separate sleeve.

I can see why the videos can make it more confusing, especially when you don't know which system is in your coach.  There is such a variety.  In the Monaco Coach world they are called snowflakes since no two are alike.  The real problem is the lack of published technical data.  If there is one thing that makes me have thoughts of going back to a production coach is the lack of technical data availability.  I see no excuse for that.