R-370 Square O-Ring (ID: 8 1/4", CS 3/16", OD 8 5/8"), 4PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-141 Square O-Ring (ID: 2 5/16", CS 3/32", OD 2 1/2"), 4PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
.R-151 Square O-Ring (ID: 3", CS 3/32", OD 3 3/16"), 48PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces.