R-374 Square O-Ring (ID: 9 1/4", CS 3/16", OD 9 5/8"), 90PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-236 Square O-Ring (ID: 3 1/4", CS 1/8", OD 3 1/2"), 120PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-327 Square O-Ring (ID: 1 3/4", CS 3/16", OD 2 1/8"), 60PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..