Couple pics of aircraft flapper doors. I'm looking for the vendor to see about the price, probably high since it's aircraft rated and certified - but they are very nice parts.
Also looking at ATL's stuff from Mark's post and they do offer flapper/trap door assemblies. It's part number KS145 and are listed as $75 per kit with the trap door, door mount plate, backer plate and the hardware. That's not a bad price point.
Jim
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