Which component ensures proper sealing in a pump system?

The O-ring is a crucial component in a pump system that ensures proper sealing. It is designed to fit snugly into the grooves of various connections within the system, effectively preventing leaks of fluids and maintaining pressure. By providing a reliable barrier, the O-ring helps keep the system efficient and prevents contamination from external sources. Proper sealing with an O-ring is essential for the overall functionality and longevity of the pump system, as it minimizes wear and potential damage caused by leaks.

In contrast, other components serve different functions. A filter is designed to remove particulates from the fluid, enhancing the system's cleanliness and protecting pumps and other components from damage. A check valve helps to prevent backflow in the system, ensuring that fluid flows in one direction. A disconnect switch is a safety device used to disconnect power from the pump, protecting personnel during maintenance or emergencies. Each of these plays a vital role in the operation of a pump system, but they do not provide the sealing function that is specifically addressed by the O-ring.