$17.40
Keeping fluid on one side of a moving joint and contaminants on the other, this seal cup rides against a shaft or bore to hold pressure and prevent leakage. Common in hydraulic and pneumatic cylinders, its flexible lip is energized by system pressure to maintain a tight seal as the piston strokes, replacing a hardened or torn original that lets a cylinder drift or lose holding force.
A seal cup keeps fluid on one side of a moving joint and contaminants on the other, riding against a shaft or bore to hold pressure and prevent leakage. Cup seals are common in hydraulic and pneumatic cylinders, where the flexible lip is energized by system pressure to maintain a tight seal as the piston strokes. A hardened, torn, or worn seal cup lets fluid bypass, which shows up as a cylinder that drifts, leaks, or loses holding force. Match the cup's inside and outside diameter and its cross-section to the seal being replaced, since a seal of the wrong size will not fit the groove or seal the bore.
