The only mention I have is in the product listing, same as on Tunze.com and it is 75mm, I assume that to be OD. Typically the outlets are molded to fit standard metric pipe dimensions and 75mm is a metric pipe size.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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