The camco extend a stay, here is an explanation of what it is,how to install and at the bottom of the page is a video of the installation.
But basically it goes on your onboard propane tank between it and its low pressure regulator, it allows hook up of an external appliance...grill, fire pit, or whatever else you may think of. It also allows you to hook up an external propane tank for extra capacity in case you main tank runs out.
Installing a Camco 59123 4 port brass tee (Extend-A-Stay).
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