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You can make that venturi easily. I've done it quite a few times. Take a piece of 3/4" pvc or 1" pvc and take a metal hose clamp and boil it for a few minutes, take it out and put the squeeze on the metal hose clamp, it'll squeeze a bit, then keep doing that until you get to 1/2". Its a smooth transition. I'm actually pondering over a new venturi that i think will be better than any of these but i need to put it into play before i tell people about it.
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There's no such thing as a normal reef, there's just reef
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