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”
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