This Medium PVDF Male Luer is for use in FAST systems. This luer is for the 3.2mm barb. It is included in the FAST Spares Kit for NexION 1000/2000 (N8150487), the FAST Deluxe Spares Kit for NexION 1000/2000 (N8150488), and the prepFAST Spares Kit (N8150452).