Great item. The packaging was marked 5/8" - 3/4". I got my money back for that. I then tried a 3/4" ID vinyl tubing and it fits snugly but is secured very well. I used a G-clamp to secure it in place in case of a power outage. It hangs directly over the tank and in the water. It provides adequate aeration and surface mixing (which means more oxygen in the water) Cheaper and better constructed than homemade PVC I will buy again for my next tank project.
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