Thread: Maximum drain flow through a 1 1/2"
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Old 05-01-2012, 11:40 PM
justincgdick justincgdick is offline
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Are you running the drain at full syphon (with a gate valve)? A 1" drain at full syphon adapted to 1 1/4" pvc should handle upwards of 2000gph.

I can't see the 1.5" having any trouble if you go full syphon.
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