Marek The only seal is 4200 or Sikaflex.
Joel On Monday, April 13, 2015, Marek Dziedzic via CnC-List < cnc-list@cnc-list.com> wrote: > Hi, > > I have a question that may sound basic: > > One of my through-hulls (drain for the head’s sink) started to leak last > spring. I solved the issue temporarily by tightening it – the valve > (seacock) screws onto the threaded through-hull. This spring I want to > solve this problem permanently. > > I just went to the boat and disassembled the seacock/through-hull. To my > surprise, I found no seal between the seacock and the through-hull. There > is a beefy backing plate and the PO (I don’t think it is factory) put some > silicone on it. But there is nothing there that is designed specifically to > seal that joint. > > Here is a link to a sketch of how this looks like (don’t lough at my > drawing skills): > https://www.dropbox.com/s/tgll2zglwvskdcr/throughhull.jpg?dl=0. > > The question is how do you correctly seal the joint between the > through-hull and the seacock. Both are Marelon. The seal is required on the > threads of the through-hull or between the backing plate and the valve body > (the red arrows in the picture show the spots). > > An added difficulty is that the valve has a 90 degree elbow and it has to > point up. So it is not necessarily possible to tighten the connection and > to position the valve correctly. > > I am thinking of making a seal that would fit between the valve body and > the backing plate. However, the correct installation calls for securing the > valve body to the backing plate with screws, so the seal should be between > the threads. > > Any suggestions would be welcomed. > > thanks > > Marek > 1994, C270, s/v “Legato” > -- Joel 301 541 8551
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