R-012 Square O-Ring (ID: 3/8", CS 1/16", OD 1/2"), 60PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-245 Square O-Ring (ID: 4 3/8", CS 1/8", OD 4 5/8"), 60PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
.R-330 Square O-Ring (ID: 2 1/8", CS 3/16", OD 2 1/2"), 60PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces.