Vacuum breaker on hand held shower with dual check valve?

[KenInCa]

We're installing a new hand held shower (Hansgrohe). The wall outlet includes dual check valves. Is there any reason we also need to (or would want to) put on a vacuum breaker? I already have it, I'm just not sure if it makes sense to use it.

Thanks,

Ken

[jadnashua]

It will be easier to convince the inspector it is to code with it installed. You really don't want it sitting in the tub and a hiccup draw water into the supply and pollute it, so a secondary control isn't a bad idea. I'm not sure about the codes WRT this.

[KenInCa]

It's a stall shower, and I don't think the hose is long enough for the head to reach the pan. But since I have it anyway, I suppose it wouldn't hurt to put it on (I was going to return it if I didn't need it, but hey, what's another $35? ). Thanks!