Reservoirs and reservoir accessories in hydraulic systems are essentially storage tanks and additional components that hold and manage the hydraulic fluid used in hydraulic systems. Think of them as containers where hydraulic fluid is stored, ready to be used when needed. Reservoirs often come equipped with features like filters to keep the fluid clean, breathers to regulate air pressure, and sight gauges to monitor fluid levels. These accessories help maintain the quality and functionality of the hydraulic fluid, ensuring smooth operation of the hydraulic system overall. They're crucial components in hydraulic systems, ensuring that the right amount of clean fluid is always available to keep machinery running efficiently.