I just went through some of this...
I did purchase a low-pressure grille.
If yours has a regulator attached to it:Tearstone is right. You'll need to convert it over.
Camping World sells the proper hose to allow you to connect your low-pressure grille to your outside propane connection on your rig.
It's part #86731
(This is a twelve foot Quick-connect hose...)
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Current coach: Tiffin Wayfarer 24 BW
"Well I may be confused... But you know I sure ain't down!"