Fresh from an estate comes this Radio Works model T-4G "Line Isolator"™ which is intended to go between your antenna and feedline to prevent RF from coming back down the feedline and into the shack.

The "G" model includes a direct ground connection. This model is rated for 1500 watts and for HF bands from 160 through 10 meters. It has the common SO-239 type connector on each end.

This appears to be unused, still in the original packaging and includes the Radio Works catalog, which includes an extensive series of articles on antenna installation.

Please see the photos for the actual items you will receive.