This is the same brass olive supplied with the tubing connectors and tubing adapters for FireBottle brand fire suppression systems. It is designed to fit the 1/4" aluminum tubing used in these systems. If you remove the connector from the tubing, you should replace the olive. Sold individually.
This olive is used on the following fittings:
FireBottle Discharge Adapter (Part No. 2061)
FireBottle Nozzle Adapter (Part No. 2063)
FireBottle Tee Fitting (Part No. 2064)
FireBottle Tubing Union (Part No. 2067)