"O" ring for NMO mount (This is the little O ring that fits on the under side of the NMO Mounting Ring) Example is Larsen NMOKHFUD mount - this is the replacement O ring seal for an NMO mount.
"O" ring for NMO mount (This is the little O ring that fits on the under side of the NMO Mounting Ring) Example is Larsen NMOKHFUD mount - this is the replacement O ring seal for an NMO mount.