Brings back memories.
I have two outlets so you can take your pick.
My Rule 3600 gph bilge pump outlet, located at the bottom of the bilge, has a 1 1/2" flexible hose going back under the aft flooring and passing upward through the gap in the flooring under the cockpit at the rudder shaft, then up as high as I could get it passing to the side of the cockpit into the starboard lasarette, through the motor lassarette bulkhead, and then a sharp 180 degree bend down passing underneath the aft lasarette floor and through an outlet fitting mounted through the hull alongside the outboard motorwell. The outlet is only a few inches above the water, but, because it is facing downward, it is concealed and doesn't hurt the asthetics.
Originally I had a check valve at the highest point, just underneath the aft part of the cockpit seat where the hose passed through to the aft lasarette. I was then advised, told, read, etc. that there MUST NOT BE A CHECK VALVE in the bilge pumpt line. The check valve can, and does get plugged just when you need the pump. A check valve, I have been told is an ultimate NO NO and can be very dangerous, according to those that allegedly know.
What I did instead, after I had removed the check valve (incidentally, I might mention, a 3" rigid plastic tube fitting replaced it going through the bulkhead and connecting the sections of hose on either side of the bulkhead), was to pierce a small hole in the upper side of the hose in the aft lasarette just forward of where it goes through the bulkhead, and insert a small piece (1/4") of clear flexible tubing into the hole. That is the anti-siphoning device. When the pump is on, a little water comes out, particularly at start up, but the clear hosing is bent at about 90 degrees so the water passes just under the aft deck and is directed to the side of the motor well so nothing gets wet. Any water that comes out drains out the motor well drain holes discussed below.
The other drain is for a Whale Gusher hand pump. The outlet for that is a 1 1/2" hose that also passes high through the aft lasarette bulknead and drains to the bottom of the aft lasarette.
I have drilled two holes at the forward end of the motorwell that drain the aft lasarette at the bottompart of the lasarette, a few inches forward of the bulkhead. So when I hand pump, the water goes into the aft lasarette through a hose. The draining of the lasarette is separate. As long as it drains faster than I pump, I'm OK. For anti siphoning, I rely on the Gusher's valve action.
Hope that gives you an idea or two.
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