Transom bilge pump discharge

If you mean the sump at the aft end of the cockpit on the centerline, the bilge pump for that area pumps to an outlet on the port side of the boat below the port lazarette. This is next to the outlet for the live well (the port side of my boat has two outlets next to each other). See pictures below.

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Yes exactly what I mean. On my older cruiser this would be a retrofit so just looking for best location before drilling. Nice pics, thanks.
 
I do not like it that low. With discharge low it makes water intrusion easier unless an upward loop is inline. Discharge pumps should not have checkvalves to prevent backflow
 
I'm with Digger. I prefer it higher up, and then would still make a bit of an upward loop if possible. Mine was already there when I bought the boat, and is on the starboard side, just below the rub rail and just ahead of the turn from topside to transom. There is room for an upward loop in the line (which comes in right astern in the starboard lazarette) and then it proceeds down to just above the fuel tanks and over to the center/transom sump mounted bilge pump.

One thing to be aware of is that if you have a boat with the "hull level" cockpit sole (i.e. before the cockpit sole/liner that came in around 2006-7 or so) then that mini sump is cored, so you may want to take that into account when you fasten your pump down.
 
When I added my stern bilge pump I just ran the discharge up & out through the boot with the rest of the control cables and over the edge of the splash well so no hole through the hull.
 
mine exits right below the rub rail. I even cut the top of my through hull ffitting's flange off straight to put it right up against the rub rail.

I used an old tank vent hole that never got closed when the vents moved into the splashwell. I just had to make it a little wider. It's got a small service loop up to the top of the gunnel, but probably doesn't need it. But, the through-hull won't take on water there. The downside is that when the pump shuts off there's plenty of water to flood my sump again, so the boat doesn't ever get pumped out all the way. I keep a bailing sponge around for the last bit. I use a check valve near the bilge pump in the summer, so the extra water just stays in the hose, In the winter I have to remove the valve or the water will freeze in there.

Those low through-hull penetrations are pretty good at clearing all the water out without a bunch of backwash. A little bit of a liability if you lose a connection though.
 
Since you will need new hose, be sure to spend the extra money for the smooth-wall instead of the corrugated "smurf" tube. Even on a short run of 3-4 feet, it makes a difference of probably 40%. When my new setup went off for the first time, it spooked me to see water shooting out 5 feet from the through hull.

Mark
 
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