3-1/2" x 3-3/4" x 1/8" O-Rings (4 pcs.)

Diameter: 3-1/2"
Diameter 2: 3-3/4"
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.