R-215 Square O-Ring (ID: 1 1/16", CS 1/8", OD 1 5/16"), 4PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-348 Square O-Ring (ID: 4 3/8", CS 3/16", OD 4 3/4"), 90PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces.
R-364 Square O-Ring (ID: 6 3/4", CS 3/16", OD 7 1/8"), 60PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces.