Installation of secondary bilge pump

[pmoat]

I am planning on installing a backup/secondary bilge pump.  

Can it share a drain line with the primary bilge or do I have to make an additional penetration for another bilge line in the hull.

[Capt. Bob]

If, for some reason you need to run both at the same time (emergency) then yes because you will end up restricting both pumps.

Planning on placing a Y connection at the thru hull?
I see a lose of efficiency with water entering the non running line.
The more I envision it, without some form of valve to prevent water from backing into the other hose, it's a poor design at best but with say a diverter type valve, it might work OK.
http://www.westmarine.com/webapp/wcs/st ... l3wERDpzkA

Still seems like a PITA to me but.......

[seabob4]

Second discharge t/hull a must.  Don't sugar coat it CB...

[Capt. Bob]

Second Don't sugar coat it CB...

I can't help it.
It's the new me.

[seabob4]

Uh, yeah, right Bob.  We know you only too well...