What sort of grill are we talking about?
Ted is right, when he says that a grille with a regulator on it will not work.
I bought a Blackstone Griddle, and converted it to work with the pre-regulated outlet on my RV. I removed the regulator (Actually: I never installed it!), and put a quick disconnect adapter in it's place.
The hose attaches to the outlet on the RV, and then to the adapter (The right angle "thingie") on the grill.