R-364 Square O-Ring (ID: 6 3/4", CS 3/16", OD 7 1/8"), 60PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
.R-348 Square O-Ring (ID: 4 3/8", CS 3/16", OD 4 3/4"), 90PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces.
5 mm, OD:12.Square O-Ring (ID:9.5 mm, CS:1.5 mm), 20PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces.