Which item is NOT listed as an accessory?

• A. Tanks
• B. Enclosures
• C. Controls
• D. Gauges

Answer: (D)

Understanding what counts as an accessory helps you read specifications accurately. Accessories are add-on components that support or protect the system rather than being the main operational parts themselves. In irrigation design, tanks provide water storage, enclosures shield and house equipment, and controls manage the operation of the system. These fit the idea of accessories because they accompany the core equipment to enhance function or protection. Gauges, on the other hand, are instrumentation used to monitor pressure or flow. They are considered part of the equipment or instrumentation set rather than an accessory. So gauges are not listed as an accessory.