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Dow 730 sealant

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Well-Known Member
Sep 15, 2006
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We have an NPT/ANfitting that will be located inside our upper fuel tank to connect our vent line. We have made a custom two-sided welding flange that will allow us to attach an AN816 nipple on one side and an AN822 elbow on the other. We are looking for a sealant for the NPT threads that will be sitting in Avgas. ACS lists Dow 730 Solvent Resistant sealant as a viable option. The stuff is 92 bucks for 3 ounces! Does anyone have another sealant that will work in those conditions or do we just bite the bullet?

Any help is appreciated.


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