Hi Gerald, welcome! Another hobbyist down island. I'm up north. The ETSS downdraft skimmers are one of my favorites after reading some articles on it in 1995. It is possible that you may have the ETSS 600 based on your description on the height and the inlet 3/4 and outlet 1 1/2 . Years ago, as far as I know there were only model 500, 600, 700, 800 in your category. The newer version I suspect for the 600 will process from 100 gallon and up. This may match to your skimmer, I don't know if there is any link to yours anymore. A Gen Max4 sounds like a good match, approx 1200 gph. I have an ETSS 1400 dual biotower downdraft driven by an Iwaki 70 for my 500 Gallon coral reef tank. Regards Ken
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