R-109 Square O-Ring (ID: 5/16", CS 3/32", OD 1/2"), 6PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-035 Square O-Ring (ID: 2 1/4", CS 1/16", OD 2 3/8"), 90PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..