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Old    d_fresh            11-03-2005, 12:18 PM Reply   
Planning on plumbing 3 Jabsco pumps. Using 1" tubing. What size thru-hull without restricting flow?!
Old    Nacho (denverd1)      Join Date: May 2004       11-03-2005, 12:21 PM Reply   
i think the size of the fitting is the same as the tubing they fit. the hole saw you end up using will prob be 1 1/4" to 1 1/2" depending on the fitting. I ordered mine from West Marine and thats how it worked.
Old    GD (greatdane)      Join Date: Feb 2001       11-03-2005, 12:39 PM Reply   
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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