Tag Archives: thru hull

New thru hulls

Anna has ten thru hulls

  1. Engine cooling in
  2. Galley sink out
  3. Cockpit drain port out
  4. Cockpit drain starboard out + bilge pump out
  5. Aft head out
  6. Aft head in
  7. Aft head sink out
  8. Forward head in
  9. Forward head out
  10. Forward head sink out

Of these, we changed seven to bronze in 2010. The remaining three were 316 stainless steel and fairly new when we bought Anna. Although we were concerned about crevice corrosion, it was not until we noticed pitting 3-4 mm deep forming on the flange of one of these thru hulls combined with rusty seepage from the ball valve that we decided to swap the three for bronze.

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Rusty seepage due to some previous owner fitting a 37mm hose to a 32mm hose adapter. Outside flange of thru hull also showed some 3-4mm deep pits.

IMG_1167

Simple tool for pulling out old thru hull

IMG_1243

New bronze fittings. Now with the correct diameter hose adapter.