R-025 Square O-Ring (ID: 1 3/16", CS 1/16", 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-435 Square O-Ring (ID: 5 3/4", CS 1/4", OD 6 1/4") (1 Square O-Ring) The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..