Marine Sanitation & Seacock Replacement, 11m Flybridge Cruiser
A blocked toilet system led us below the waterline to a far more serious find, a badly corroded seawater-intake seacock that could have sunk the vessel. We rebuilt the black-water system and renewed every below-waterline fitting before relaunch.
An 11-metre flybridge cruiser came into our GCCM shipyard with a blocked, unreliable toilet system, but the real story was below the waterline. Inspecting the black-water system, our engineer found the primary three-way diversion valve seized solid and the main toilet discharge hose completely choked. A check of the seawater side then uncovered something far more serious: a badly corroded below-waterline intake seacock that could have flooded the vessel had it failed at the berth.
We rebuilt the marine plumbing and sanitation system end to end, replacing the seized diversion valve, cutting out and renewing the solidified discharge hose, checking the macerator pump, and re-making every joint with new marine-grade hose clamps. The bilge and heads were cleaned and disinfected, and the system was pressure-tested from the toilet both overboard and to the holding tank, with no leaks detected.
The corroded seawater intake was cut out and replaced with a new bronze through-hull, seacock and hose tail, bedded in Sika 291 marine sealant and properly bonded for galvanic protection. The existing discharge seacock was wire-brushed, inspected and improved with a new elbow for better flow. The vessel was relaunched within her hardstand window with every below-waterline fitting renewed and certified leak-free. A genuine sinking risk had been eliminated before it became an emergency callout.
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