Stuffing Box Leaking : Purpose of a Stuffing Box: A stuffing box is used to maintain or seal the pressure of fluid during unit operation. The pumping unit moves around the rod to pull whatever you are trying to access — such as oil — to the surface. The stuffing box helps maintain the correct pressure inside the unit during use. It prevents leakage around a piston, rod and other moving parts that work inside a cylinder or other vessel. Measure a Stuffing Box: You will want to measure your stuffi