Join Date: Jun 2006
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Do you mean it whistles when it's dry or wet? From the feed hose or from the pump hose? Is the diverter valve to the holding tank set to the tank or to the "offshore option"? Do you have a syphon break and could it be this or a joker valve "whistling"? Do you drain the bowl and shut off the intake seacock in rough weather?
I haven't had this problem with my Lavac, but as you can see, I had six supplementary questions occur to me as fast as I could type them...including the possibility of a slight break in your vacuum lid gasket with the moving water forming a "bellows" effect.
Pump it dry and see if it keeps up. I tend to pump dry in a seaway anyway. Even if it's clean, I don't want standing water sloshing around underway, nor do I necessarily want the open seacock.
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