R-443 Square O-Ring (ID: 7 1/2", CS 1/4", OD 8"), 2PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-433 Square O-Ring (ID: 5 1/2", CS 1/4", OD 6"), 12PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-256 Square O-Ring (ID: 5 3/4", CS 1/8", OD 6"), 48PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
.R-331 Square O-Ring (ID: 2 1/4", CS 3/16", OD 2 5/8"), 24PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces.