Damn.. I threw away a waterlogged expansion tank just like that about 2 months ago... got a brandy new one on my boiler now... <sigh> Great idea though. Nicely thought out. I usually launch in semi-fresh water and run downriver to the ocean, but there's always a trip or two to a salt water launch ramp. Might not be a bad idea. Gotta think about how to rig it up.. are those 180* irrigation nozzles?...and maybe a bigger tank. I reely like the part about washing out the brakes. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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