Square O-Ring (ID:22 mm, CS:3 mm, OD:28 mm), 48PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-161 Square O-Ring (ID: 5 1/2", CS 3/32", OD 5 11/16"), 6PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..