Graco 107078 Packing O-Ring

The Graco 107078 Packing O-Ring operates as a sealing element that controls fluid containment within pump and hydraulic assemblies. It works by compressing into a designated groove between mating surfaces, where it forms a circular seal that restricts leakage while allowing internal components such as pistons or shafts to move during pressure cycles. This compression-based sealing action supports controlled fluid movement within the system. This is typically positioned inside pump housings, valve sections, or piston assemblies where moving parts interact with sealed chambers. It is installed during repair or replacement of sealing components in compatible handling equipment.