[C320-list] Head valves-- OK leave open?

[belairlk at aim.com]

Catalina recommends closing the head seawater intake valve and head discharge to sea valves when leaving boat.  Some owners say it's OK to just leave them open, as boat won't flood.  Any comments or experience to indicate they should be closed?
 
Len Krane
Aqua5  #1070
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