Like all applicators in their range, Simcro drench guns are manufactured from high-grade engineering plastics which are generally more durable than metal. The variable dose adjustment is fully adjustable, and features rotation resistance to eliminate accidental adjustment of doseage. The polypropylene barrel is stronger than polycarbonate barrels and is more resistant to a greater range of animal-health remedies. The gun valves are large-diameter free flow, to make easier discharge and refill of viscous liquids. The nozzle valve is easily removed for cleaning, and the valve components are substantial enough to be unlikely to be lost. Drench nozzles are: 15ml and 30ml - 10cm x 8mm for sheep and calves; 60ml - 15cm x 8mm for cattle. The drench nozzle locks in place at the desired angle.