R-215 Square O-Ring (ID: 1 1/16", CS 1/8", OD 1 5/16"), 48PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-046 Square O-Ring (ID: 4 1/4", CS 1/16", OD 4 3/8"), 16PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..