I went with this valve mounted on a horizontal, I never thought I should remove my returns and drill a Anti siphon in them, I added it on mine as I have 30 plus feet of plumbing and this helps even the return line draining at all.
http://www.bulkreefsupply.com/georg-...eck-valve.html
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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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