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See my post above, I would go with Attwood's Tsunami T800 over the 403C.

I would probably not recommend using the 403 replacement for this application. It is designed for a livewell, in which case flow rate is not of huge concern. Finding a pump with a straight intake...

Moomba uses rule 800GPH pumps for draining prior to 2009. Any 800GPH Aerator style pump with 3/4" NPT threads will do the job. Installation is around 15 minutes. Feel free to contact me if you...