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Old 02-16-2007
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Thru Hull Fittings

I have the Mermaid Air unit all installed and just need to go back and seal and hose clamp everything. In there manual they say to us the 3M5200 on all the threaded fittings (ball valve to t-hull, and threads on hose barbs) does this sound like a good idea? Thanks.

Scott
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Old 02-16-2007
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Scott...I would use 5200 on the through hull fitting but something less permanent on the rest...maybe 4200. I just use silicone and double clamps on any hose fittings as I can count on needing to remove those.
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I think I would go with a real pipe thread sealant on the threaded fittings, like a Loctite or Permatex brand sealant.

I'd probably go with a bedding compound on the thruhull rather than 5200. In the event there is a frozen seacock valve that needs to be unscrewed from the thruhull, I prefer to pull the thruhull and rebed it just in case wrenching on the valve damages the thruhull to hull seal. Maybe 5200 would hold the thruhull in place well enough that the seal won't be broken, but then again, maybe not. With 5200 though, I expect the thruhull would be a challenge to remove and rebed.

Tim
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FWIW --

Using 5200 on threads guarantees they won't come apart unless you use a torch. And you won't be able to pull the hose off the barb.

My bias:

5200 for the thru-hull-to-hull joint;

Teflon pipe-joint compound, or heavy-duty (pink) Teflon tape for the threads.

If the barb is good, just a pair of tight AWAB-brand hose clamps (All 300-grade stainless, very durable).

That way, when you (or the next owner) want to take it all apart, you'll be able to.

Charles
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