I am not a fluids expert... My sense is the wider the better with diminishing returns. The Jabsco pumps connect 1" OD and 1/2" ID. area of 3 pumps = area of one circle 3 * pi * 1/4**2 = pi * r**2 r = 0.433"; d = 0.866" (diameter). Thus, 1" or 1.25" hull hole should do it. Anything larger that 1.25" is probably overkill.
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