R-362 Square O-Ring (ID: 6 1/4", CS 3/16", OD 6 5/8") (1 Square O-Ring) The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-206 Square O-Ring (ID: 1/2", CS 1/8", OD 3/4"), 90PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..