Best "U" tube overflow value ?

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i use amiracle u tube overflows. they have been modified to handle more gph than the standard, and they're outstanding, except for all the dang noise. next time, i'm drilling (haven't heard that one before....)
 
Whats the head on the mag 9.5. A stock single U tube overflow will be rated at 600-700gph where as the double U tube overflow is rated at 2X that. If your mag has a head of 3-4' then it might be within the limits.
 
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