R-121 Square O-Ring (ID: 1 1/16", CS 3/32", OD 1 1/4"), 24PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-229 Square O-Ring (ID: 2 3/8", CS 1/8", OD 2 5/8"), 90PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..