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[Bill Shreeves]

I'm replacing my old AC with a new one as well as the duct etc.  Having a tough time finding a plastic 6x6x4 wye but plenty of galv metal.  Any thoughts on using the metal fitting under the V-Berth to branch from the 6" main flexible insulated duct?

[Noah]

I don’t see a real problem using a galvanized fitting in this instance. The air going through the duct I guess is pretty dry. If you wanted to hedge your bets you could paint the fitting. I used this Rustoleum Universal Bonding primer (specifically listed to overpaint galvanized metal) to undercoat my anchor chain before painting colored chain length markings. It worked well.

[Bill Shreeves]

I was wondering how corrosion resistant the galv metal might be over time knowing the air would be pretty humid when the ac isn't running.

[Gregory M]

Bill, don't forget condensation! Cold air blowing through pipes/fittings, meeting warm/moist air on outside fitting. Ducts should be insulated!

[Bill Shreeves]

Bill, don't forget condensation! Cold air blowing through pipes/fittings, meeting warm/moist air on outside fitting. Ducts should be insulated!

I'll be using insulated flex duct and I intend to insulate the wye as well.

[Steve McGill]

Suremarineservice.com

[MarcZ]

How about this one MSI HY664

https://marinepartssource.com/6-x-6-x-4-air-divider-hose-y-msi-hy664

https://www.suremarineservice.com/Cool/Air-Divider-Hose-Y-Wye/HY664.html

[Bill Shreeves]

Thanks Marc!

Steep price but, no worries about corrosion, and this is a big plus, it includes an adjustable diverter!  Shipping was an unreasonable $32 to boot but, it's the only place that has one so, I ordered one.

[Noah]

When it’s 100 degrees and humid outside this Summer, the price won’t seem so extreme.

[Bill Shreeves]

Especially on the Chesapeake where it gets pretty steamy in august!