I just ordered my first Sea swirl. Do they come predrilled for siphon break? Or do they need to be drilled? Where is best to drill them just above the 90?
If you have the exit from the nozzle near the water surface and/or you have a good sized sump, you probably don't need to drill anything. Generally though, the location to drill is just below the water surface, and you won't know that exactly until you install the thing.
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