Depends on what you are "appealing" (yes, I know, not the rule book use of the word - hence in quotes).
If you are "appealing" a checked swing (PU calls ball) or possible batted ball hits the batter in the box (PU calls live ball) (two common plays that are sometimes difficult for the PU), most of the time the PU will go to his partner if asked properly. Best to come from the catcher, but coach is OK, too, if no ranting or charging.
For a play on the bases, you should have something you wish the umpire to check with his partner about - not just that you disagree with the judgment. For example, a pulled foot or a screened swipe tag. Something of that nature. If you just disagree whether the runner beat the throw, you will not likely get anywhere.
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Tom
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