Which of the following is used to provide access to tanks and voids?

The manhole cover is designed specifically to provide access to tanks and voids, allowing for maintenance, inspection, or operational purposes. It usually has a circular opening that can be covered when not in use, ensuring that the area is secure and that any hazardous materials within the tank or void are contained. The robust design of manhole covers is intended to withstand heavy loads and prevent unauthorized access.

While access panels and inspection hatches can also provide access to certain areas, they typically do not have the same application as manhole covers in relation to large tanks or voids. Access panels are often smaller and used for servicing equipment, and inspection hatches can be designed for inspections but do not specifically serve the same broad purpose as manhole covers. Safety grates are mainly used for safety and ventilation rather than providing access to enclosed spaces. The specific functionality and design of manhole covers make them the correct choice for this context.