Square O-Ring (ID:30 mm, CS:3 mm, OD:36 mm), 36PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
.Square O-Ring (ID:28 mm, CS:1 mm, OD:30 mm), 4PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces.