If the sink has NO Overflow then you're using the wrong drain............ Check out these drains made for vessel sinks...... http://www.plumbingsupply.com/vessel_sink_drains.html ALSO the plywood should NEVER be included within the wet plumbing.......the completed sink and attached plumbing sits "on top" of the maple ply (drill a larger hole) "...measure once.....cut twice....throw that one away and cut a new one...."
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