On Sun, 21 Dec 2008 22:45:50 -0800 (PST),
wrote:

This installation diagram from Vetus on their water strainer
specifically shows that the strainer be at least 15cm / 6" ABOVE the
waterline.

http://www.vetusweb.com/manuals/file...01%2007-07.pdf


Probably because their strainer has a plastic top (polycarbonate)
which I regard as unseaworthy.

Proper marine strainers look like this:

http://marineengineparts.com/shopsit...l/page515.html