Designed for use with pour-on medications, the dosage adjusts from 10 ml to 70 ml in 2 ml increments. Clear poly barrel is marked with proper pour-on cattle wormer dosage up to 1540 lbs. The shower nozzle avoids wastage from splashing and is angled allowing the operator easier access to the animal. The Prima-Tech Pour-On Gun comes with standard pour-on nozzle and 5' draw off tubing.