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Properly adjusting and maintaining the plumbing systems of agricultural sprayers can improve the efficiency and uniformity of chemical applications. The plumbing systems of agricultural sprayers are usually considered foolproof. Sprayer problems may occur however, when plumbing and/or modifications are improperly done or maintenance is ignored. Retrofitting, addition of electrical control systems, and replacement of pumps or nozzles require knowledge of the plumbing system and how changes will affect sprayer performance. Routine maintenance of the plumbing systems is essential.