Through-Hull Fitting Inspection

🛠 Tools & Materials Needed

Step-by-Step Instructions

1. 1

   Close all seacocks and visually inspect the exterior through-hull fittings during haulout.

2. 2

   Check bronze fittings for dezincification (pinkish color indicates zinc loss).

3. 3

   Test each seacock operation: it should open and close smoothly.

4. 4

   If seacock is stiff, disassemble the tapered plug, clean with wire brush, and repack with grease.

5. 5

   Inspect the flange bedding compound for deterioration or cracking.

6. 6

   From inside the boat, check the backing plate for signs of movement or water intrusion.

7. 7

   Replace any through-hull fitting that shows pitting, cracks, or dezincification.

8. 8

   Apply antifouling paint around through-hulls to prevent growth blockage.

9. 9

   Label each seacock with what it serves (engine raw water, cockpit drain, etc.).

10. 10

    Practice closing all seacocks blindfolded in preparation for emergency use.