Hi, A loop is a good idea, a vented loop even better, but a cost effective solution would be to install a simple check valve. If it is installed down near an automatic pump, then you have the added benefit of the valve keeping the hose water from filling back into the bilge after the pump shuts off.
I have also seen boats which use only one hose for both electric bilge pumps and deck mounted hand bilge pumps (like the Whale Gusher 10). That is, the electric bilge pump hose is routed to the hand pump and then out . This set up is nice as the hand pump acts like a check valve allowing water to flow only out, and it uses only one through hole. - Paul E. s/v Johanna Rose Carrabelle, FL On Sep 12, 2012, at 8:53 AM, cnc-list-requ...@cnc-list.com wrote: >> WE had a race years ago, where we sucked water into the manual bilge pump >> going 10+ kts downwind under the kite. Had to run the electric and hand >> pump to get the water to go back out again, made me think that you might >> need one of those vacuum breaks in the bilge pump outflow. Any lister >> tried those? >> >> ALEX GIANNELIA
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