If your really concerned about drain back. I have always thrown in a check valve more so on the fact my skimmer is very sensitive to water levels and if the pump fails i don't want skimmate everywhere. The Wye valves are really good ones.
http://www.bulkreefsupply.com/store/...s/check-valves
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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