Automatic self-filling injector for use with Zuprevo (tildipirosin). Accurately delivers selected dose. Complete with tubing, draw off caps, and three 16 ga x 1/2" leur slip needles. Durable V-grip plastic injector design. Metal leur lock tip and removable plastic barrel for easy cleaning. Adjustable dosage from 50 lb. to 1000 lb. in 50 lb. increments.