R-263 Square O-Ring (ID: 7 1/4", CS 1/8", OD 7 1/2"), 12PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-216 Square O-Ring (ID: 1 1/8", CS 1/8", OD 1 3/8"), 120PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..