seacock

  1. Randall Schmidt

    Composite vs Bronze Seacock

    I have a 1984 O'Day. When I got it just over 10 years the seacocks were frozen. They were bronze. I replaced them with Marelon composite as they were recommended by my boat yard. One is failing now. The raw water input valve is stuck open. Should I go back to bronze? I'd like to get the...
  2. American_Mainsail

    Groco SBV Emergency Seacock

    SBV-1250-P 1-1/4" Flanged Seacock with Side NPT Port| GROCO I'm thinking about doing an install of one of these. These special seacocks are a cool concept. The idea is that the engine seacock has a 1" NPT port in the side that allows it to be plumbed to a pickup in the bilge. In the event of...
  3. 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...
  4. 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...