Square O-Ring (ID:11 mm, CS:1 mm, OD:13 mm) (1 Square O-Ring) The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
.R-215 Square O-Ring (ID: 1 1/16", CS 1/8", OD 1 5/16"), 16PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces.