A durable, impact-resistant syringe that provides a quick bottle-changing system for efficient application of all animal health injectables. The self-contained, one-handed unit is ideal for full mobility and automatic refilling of syringes and prevents the injectable returning to the bottle. The line feed convertible barrels allow convenient change from a bottle mount to a line feed vaccinator. Packaged in a clear plastic bag with a header card for hanging and contains: 100ml/20mm Fast Fit, one bottle collar (20mm), one metal luer lock needle nut and one lube packet.