This should help. You close the main RV tank valve and connect the portable tank to the vertical connector. My setup has the additional connector (with the red shutoff) that I use for the BBQ.
Note that what the picture shows is all high pressure. Some RVers prefer to tap into the low pressure side for their BBQ (to the right of the regulator) meaning their BBQ will not need a pressure regulator.
Or I can use a portable tank for both the RV and the BBQ as needed.
[img]https://i.imgur.com/9Dcdvkz.jpg "target=new"][IMG]https://i.imgur.com/9Dcdvkzl.jpg "border=0"[ width=800[/img]
