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nswsailor said..
Around 2000 a Top Hat leaving the Camden Haven Inlet got pounded by the bar [went out the wrong official way!] and some gear came loose and sheared off one of his PLASTIC sea cocks.
He almost sunk but due to quick work on his part and Marine Rescue he made a full recovery.
Replaced all his seacocks with bronze ones!
If it sheared through water force then it was poor quality. Look at manufacturers listed above for high quality survey standards plastic ones.
It may have sheared due to a loose object hitting it and that's the skippers fault, not the fitting!
The issue with bronze or SS is that the quality of the metals used is cheap and unknown due to the dedicated marine market being tiny compared to land based uses where corrosion is not as much of a factor.
I know of a 48ft cat who brought the best quality SS skin fittings and valves when boat was built a few years back.
After first Pacific cruise, they were corroded to hell and all were replaced with Forespar plastic!!
Boats now done another 25,000 miles with no issues.