R-223 Square O-Ring (ID: 1 5/8", CS 1/8", OD 1 7/8"), 2PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-112 Square O-Ring (ID: 1/2", CS 3/32", OD 11/16"), 16PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..