Corroded through-hulls and seacocks are the #1 sinking cause for boats at the dock. Pink discoloration on bronze means dezincification — the metal is failing.
What to Check
1
Visual inspection (annual)
Pink/copper color on bronze = dezincification. Green crust = surface corrosion. Both need attention.
2
Hammer test
Tap the through-hull with a small hammer. Sound metal rings; corroded metal thuds. Don't tap hard — you can break a failing fitting.
3
Seacock operation
Seacocks must operate easily by hand. Frozen handles will shear off in an emergency.
4
Bonding wire continuity
All underwater metals should be bonded. Missing bonds accelerate galvanic corrosion.
When to Call Us
Any pink-tinted bronze gets replaced — period. We do this in haul-out with proper Marelon or DZR bronze fittings.