Like probably every other RV out there, our motorhome has a propane system. The water heater, forced air heater, stove and fridge either run exclusively on propane or on an either/or electric/propane system. The RV also is equipped with a small bank of monitors that tell us how full our holding tanks are, how much charge our battery has, etc. One day I flipped said switch and noticed that the propane was getting low. I then thought, "Where IS the propane tank?" On our camper, the propane tanks are outside in the front, easily accessible. On the motorhome, the tank is mounted under the RV. There's an access door on the side to fill it. It DOES NOT separate from the RV, though. Now, I didn't want to have to disconnect everything from the RV to drive it over to the filling station, so I asked if there was anyone who did mobile fills. I was told no, but that there was a valve, called an extend-a-stay valve that could be added to the propane line. This valve would allow me to add an external tank. Yay!!!! So, I purchased said valve (rather pricey, I might add) as well as a tank and a hose and hooked them all up.
The shiny bit in the middle is the new valve. It took me a few tries to get it tight and leak free. I found that our old regulator was leaking at its connection too!!! I imagine that it had been for the whole time we've had the RV. Yikes! But, now it's all tight and leak free. And, we've got gas, which is easy to refill.