I purchased a 27/23 non fireproofed safe and had an issue with the seal of the door. It had too much clearance and would not seal tight making humidity an issue. I found some rubber "duct" seal I had in my garage and it works perfectly. It came out of a wheel barrow of trash on a job site, so I don't have any info on this. I believe it was used on high pressure duct work to seal the joints. It can probably be found at a plumbing/mechanical supply house.



It was the perfect size. Any help identifying this material would be greatly appreciated.

Thanks,