Power unit reservoirs for hydraulic power units (HPUs) hold overflow fluid to accommodate fluctuating fluid-volume requirements and compensate for fluid leaks. They also can act as a radiator to help dissipate heat from the fluid and compensate for volume loss when the fluid cools. Reservoirs should have a capacity 3 to 5 times larger than the system requires.

Remote control handsets for hydraulic power units (HPUs) have an extension cord that allows users to operate the power units from a distance, such as when there are safety concerns or when the power unit is not easily accessible. They are commonly used on compact AC and DC power units. 

Valve manifolds for hydraulic power units (HPUs) are added to hydraulic systems to create custom fluid flow configurations between the actuator and pump. Primarily used with compact AC and DC power units, manifold blocks are used with valves to divert, stop, or start fluid flow as required, such as when operating a backhoe or when using one power unit to power two tools. Manifolds are generally less likely to leak than tubing.