thru-hull

  1. L

    Are the thru-hull/seacock NPS threads supposed to be watertight?

    And, if so, how? It is my understanding that in standard plumping you use pipe dope on NPT threads to make them watertight, but not on NPS threads. For NPS threads, the connection is watertight because there is an o-ring or gasket which gets compressed to create the watertight seal. However...
  2. L

    Should I turn the thru-hull or the seacock when bedding a new thru-hull and seacock?

    I am in the process of rebedding some thru-hulls and seacocks and got the same, surprising advice from two unrelated people in the boatyard. They both said that instead of bolting the flanged seacock in place, and then screwing in the thru-hull from the outside of the boat that I should instead...
  3. RoyS

    Thru Hull Problem

    I purchased an Isotherm Refrigerator Conversion Kit during the great Defender Sale last week. The kit included a "Self Pumping" thru hull that replaces the galley sink drain with a larger thru-hull that incorporates the refrigeration lines, now sea water cooled. The problem is that the included...
  4. BranThomps

    23.5 Thru-hull fitting sizes/upgrades

    Hi! New owner of a 1993 23.5 and I'm going through the boat to make it ready to launch. I was cleaning the sink and noticed that the drain was starting to crack and was brittle. Upon trying to remove the sink drain, it broke completely and the drain hose put a strain on the outer thru-hull...