The Gemini Cool because of its channel size I do not think you want to enlarge the hole in the Lexan. If you do you may risk crossing over into the next channel. The Lexan is tapped for 1/8" pipe thread. The top is sealed. I bought 1/8" to 1/2" OD barbs from McMaster Carr. The main reason I changed out the barbs was the rad I built I used 1/2" OD barbs and the pump that is backordered is for 1/2" ID tubing. You’re not going to gain anything by enlarging the hole in the Lexan. The High Volume Block was designed for pumps of 360 GPH. To answer you question the barbs are 1/2” OD and 5/16” ID.
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