R-220 Square O-Ring (ID: 1 3/8", CS 1/8", OD 1 5/8"), 24PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-437 Square O-Ring (ID: 6", CS 1/4", OD 6 1/2"), 24PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
.Square O-Ring (ID:8 mm, CS:1 mm, OD:10 mm), 60PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces.