3-7/8" x 4-1/8" x 1/8" O-Rings (4 pcs.)

Diameter: 3-7/8"
Diameter 2: 4-1/8"
Thickness: 1/8"
Type: O-Ring

Box of 4.

An O-ring is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a disc-shaped cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface.