Connecting my LP Generator to my RV's LP Port

So... I have a generator that's been converted to propane, and it has a 3/8th inch mail quick connect built into it.  My RV has a 1/4 inch quick connect port.  So how do I make these two talk to each other?

About RV LP Pressure and Fittings:

1. The RV propane system is regulated--which is to say that the high pressure connections from the propane tanks go through a "regulator" (pressure regulator) to lower the pressure down for use in the RV. The quick connect port on the front of my RV is low pressure.
2. The fittings that I use for my air-driven tools or are otherwise listed as "universal" or "industrial" in Home Depot etc. do NOT apply to gas fittings like these.
3. You're looking for "NPT" fittings (which stands for "National Pipe Threading"). Sometimes the NPT is modified with an M or an F (e.g. MNTP or NTP(F)), indicating for Male or Female fittings.
4. Make sure any hoses you use are specifically designed for LP or Natural Gas.
5. Unless you're experienced with this sort of thing, you might struggle to find the right fittings. I did. Be patient, overbuy the fittings you think you might need, and return what you don't use.

Building My Custom RV LP Hose:

I checked out a bunch of hoses to start with. Knowing I wanted enough length to reach from the front of my RV to a generator parked in my truckbed--or to a grill that was placed in a comfortable position out front under my awning-- I wanted a hose that was 10 feet or longer.  I had three choices when it came down to it:

• I could use a hose with 1/4 inch fittings, matching my RV
• I could use a hose with 3/8 inch fittings, matching my generator port. (Note: I'd already heard that the genny would run on a 1/4 hose if needed).
• I could contact a local propane company and ask them to work up a hose with mixed fittings.

I settled on the 1/4 inch hose for two reasons 1) if I ever ended up wanting to run the grill and genny together, I'd want two smaller hoses and 2) it just worked out that it was fewer pieces and parts to convert if I started with the 1/4 inch hose and 3) if I made a custom hose with mixed fittings, I'd always need to use an adaptor to run either the grill or genny... but if I had a hose that worked for one of the two, I only need to use an adapter with one of them.Starting with the male end of the hose (already fitted with a 1/4 inch male quick connect) and working backwards to the generator, here's what the entire setup looks like:

1. CamCo 57282 10' Propane Quick Connect Hose
2. into the female quick connect on the other end of the hose I inserted a CamCo 59903 Propane Quick Connect Fitting
3. ...from there I screwed on a 1/4" NPT Female to 3/8" NPT Male Reducer (though in this case, it's "enlarging" not reducing).  (I picked up a Husky version at Home Depot, but the link above brings you to one on Amazon.)
4. ...from there I screwed on a 3/8" female threaded fitting which terminates in a 3/8" female quick connect port. I got mine as one piece of this part of this multipart Mr. Heater connector kit.

Here it is all laid out with the generator on the left and the RV on the right (click to zoom):(In the photo, you'll see yellow sealing tape.  I opted for pipe dope instead (when I realized I had some) BUT these brass fittings are actually designed to be used without any additional sealant at all... they are designed to deform and seal against each other according to the NPT specification. )Don't forget to leak check everything!

On to the Weber Q...

Secondly, and separately, I wanted to modify my Weber Q series grill so that I can connect it to my RV using the same hose I use for my generator, which means I need to install a quick connect on the grill and bypass the regulator.  If I want to keep the option of using my regulator with higher pressure tanks I need to make that quick-connectable too.  That process detailed in another post.