Which of the following is included as an accessory?

• A. Nozzles
• B. Regulators
• C. Tanks
• D. Housings

Answer: (C)

In irrigation design, accessories are items that support or enable the system without being the primary water‐distribution devices themselves. A storage tank fits this role because it provides reservoir capacity for the pumping system and helps ensure a stable water supply, which supports operation rather than delivering water directly to plants. Nozzles are the actual discharge outlets that create the spray pattern from heads, so they’re a primary distribution component. Regulators are used to control pressure at the source or along the line, which is a fundamental control function rather than an added support. Housings are the protective shells or casings that are integral parts of heads or valves, not separate support equipment. Thus, the tank is the item categorized as an accessory.