Right angle, BNC (Female) jack to TNC (Male) plug tray RF adapter.
As part of existing GNS430 and GNS530 upgrades to WAAS the antenna needs to be changed. The new antenna requires a TNC connector whereas the old antenna used a BNC. The choice is either to change the connector or use adapters.
Changing the connector is not always practical due to useable cable lengths and/or location. The alternative is using a BNC to TNC adapter, ideally with a right angle.