R-044 Square O-Ring (ID: 3 3/4", CS 1/16", OD 3 7/8"), 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), 48PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces.