R-326 Square O-Ring (ID: 1 5/8", CS 3/16", OD 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"), 12PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
.R-159 Square O-Ring (ID: 5", CS 3/32", OD 5 3/16"), 60PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces.