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post #1 of 4 Old 09-19-2009 Thread Starter
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Marelon and PVC

I am replacing some thru-hulls and removing the old seacocks from the head that no longer exists. My plan is to use marelon thru-hulls and then to cap them. Since there are no marelon caps (not made) I was thinking pvc. Bronze is too expensive and I want to keep the thru-hulls option without patching the holes.
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post #2 of 4 Old 09-19-2009
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Patch the holes, use bronze seacocks, sink the boat - your choice. Just curious - what is "too expensive" when compared with the loss of a
a boat, the liability of removal of a sunken boat, environmental liability, etc...?
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post #3 of 4 Old 09-19-2009
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Quote:
Originally Posted by Jmac62 View Post
I am replacing some thru-hulls and removing the old seacocks from the head that no longer exists. My plan is to use marelon thru-hulls and then to cap them. Since there are no marelon caps (not made) I was thinking pvc. Bronze is too expensive and I want to keep the thru-hulls option without patching the holes.
If you want to cap thru-hulls then use a Marelon valve (NOT PVC) on a Marelon thru-hull and close the valve. The safest choice is to patch the holes with a tapered repair. It is not a good idea to mix different materials below the waterline that have differnt thermal expansion coefficients such as Marelon & PVC or Marelon & bronze. PVC should be avoided at all costs for below waterline use as it fractures easily and is not a reinforced plastic product. I have personally seen a Marelon valve cracked that had been threaded onto a bronze thru-hull..

If you MUST cap the Marelon thru-hulls a bronze cap is a far better idea than PVC but it is still not a good idea due to mis-matched threads. If you must mix Marelon & bronze the male Marelon should thread into the female bronze. Avoid threading male bronze into female Marelon..

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post #4 of 4 Old 09-19-2009
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NPT caps are not that expensive in bronze...
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