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Old 12-05-2024, 14:08   #1
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Thruhull seacock driving me mad, need advice

I uave a drain for the head sink above the waterline, the low quality pin valve gave up in the open position a while back and now that I have the boat out of the water its a good time to take it off and replace with a decent ball valve. The only issue is that I cannot for the life of me get the seacock off the thruhull. Both bronze, the fittings seem to have fused together. I can get a good grip on the retaining ring for the thruhull but then the seacock and thruhull rotate, dragging whats left of the sealant with it. If I grip onto the thruhull from the outside, the seacock does not budge no matter how much I hammer onto the pipe wrench grabbing the seacock from the inside. Short of grinding the thruhull flange from the outside, what options do I have? I am out of ideas at this point.
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Old 12-05-2024, 14:36   #2
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Re: Thruhull seacock driving me mad, need advice

angel grinder and cut. 2-3 minute job or make THRU HULL PULLER
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Old 12-05-2024, 14:45   #3
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Re: Thruhull seacock driving me mad, need advice

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angel grinder and cut. 2-3 minute job or make THRU HULL PULLER
Yeah, maybe I need to do that. I would just hate wasting a solid bronze thruhull if I could get that d@mn seacock off it. I have plans to apply some heat tomorrow with a torch as a last resort.
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Old 12-05-2024, 15:19   #4
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Re: Thruhull seacock driving me mad, need advice

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I have plans to apply some heat tomorrow with a torch as a last resort.
I'm not so sure I'd be taking a torch to a seacock/thru hull on a fiberglass boat.
You could very easily have a disaster on your hands.
Resin does not like torches.
As others have said, get out your oscillating tool and cut the thru hull off.
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Old 12-05-2024, 16:17   #5
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Re: Thruhull seacock driving me mad, need advice

If you haven't already, take a look into the through hull from the outside and see if there are two little nubs inside, 180 from each other. If so, they are meant to give you purchase to counterhold the through hull as you turn the nut inside. A piece of flat bar and an adjustable wrench will serve. Of course, you need a second person on the outside to do the holding.
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