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I guess the question is what do you need it for? I have one on my calcium reactor so water doesn't back up into my carbon doser and ruin it. I really wouldn't want to run without that as the carbon doser is quite expensive. I bought a medical grade check valve from aquarium plants.com that sells the doser to protect my investment and it seems to work well.
And that's that I meant by handling the drain back from the display. The returns should be included in that calc. I wouldn't sleep right at night knowing that I had a siphon break or check valve determining whether or not my floor was wet in the morning. Just trying to help you out man.