I use one for my CPR overflow. As far as i know it has a check valve of some sort. Ive unplugged it while the cpr was running and it didnt allow any air back into the overflow. I wouldnt think itd allow a siphon of water either but someone else should confirm this first...
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- 33 Gal - 20Gal Sump, MP10/Hydor Powerheads, Aquaticlife 4x T-5HO, Vertex IN100, TLF w/Biopellets, Tunze ATO
-45GAL Build in Progress!-
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