Something like these?

https://a.co/d/7DGkUd0%EF%BF%BC PZRT 25pcs EPDM Neoprene Rubber Bonded Sealing Washers, 304 Stainless Steel M6.3 x 16MM Waterproof Gasket a.co

On Feb 7, 2023, at 3:58 PM, Joseph Amato via AMSAT-BB amsat-bb@amsat.org wrote:

I recently built two low noise amplifiers (2 m and 70 cm) for satellite work, hoping to mount them right at the antennas. They are in small Hammond die cast aluminum boxes. To mount the boards inside, I had to drill several 4-40 thru holes through each box. I’m worried about slow water seepage through these screw holes. Can you suggest a good way to seal them?

Thanks!

Joe K1MNY

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