Catalog Hardware O-Rings and O-Ring Kits O-rings and O-ring kits help ensure a tight seal to prevent air and fluid leaks in applications such as air conditioner repair or plumbing installations. ◀◀ ◀ ▶ ▶▶ O-Ring: 411, 2 3/4 in Nominal Inside Dia., 3 1/4 in Nominal Outside Dia., 70 Shore A, Black, 5 PK O-Ring: 254, 5 1/2 in Nominal Inside Dia., 1 5/16 in Nominal Outside Dia., 90 Shore A, Black, 2 PK Backup Ring: Hytrel, For 210, 0.045 in Thick, Black, 50 PK O-Ring: 233, 2 7/8 in Nominal Inside Dia., 3 1/8 in Nominal Outside Dia., 90 Shore A, Black, 10 PK O-Ring: 133, 1 13/16 in Nominal Inside Dia., 2 in Nominal Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 2 mm Nominal Inside Dia., 6 mm Nominal Outside Dia., 6 mm Actual Outside Dia., Black, 50 PK O-Ring: 210 mm Nominal Inside Dia., 218 mm Nominal Outside Dia., 218 mm Actual Outside Dia., Black O-Ring: 136, 2 in Nominal Inside Dia., 2 3/16 in Nominal Outside Dia., 75 Shore A, Brown, 10 PK O-Ring: 427, 4 3/4 in Nominal Inside Dia., 5 1/4 in Nominal Outside Dia., 90 Shore A, Black, 2 PK O-Ring: 53 mm Nominal Inside Dia., 56 mm Nominal Outside Dia., 56 mm Actual Outside Dia., 5 PK Backup Ring, Contoured: Buna N, For 231, 0.05 in Thick, 0.174 in Radius, 50 PK O-Ring: 70 mm Nominal Inside Dia., 76 mm Nominal Outside Dia., 76 mm Actual Outside Dia., Red, 5 PK O-Ring: 149 mm Nominal Inside Dia., 155 mm Nominal Outside Dia., 155 mm Actual Outside Dia., 5 PK O-Ring: 14.2 mm Nominal Inside Dia., 19 mm Nominal Outside Dia., 19 mm Actual Outside Dia., 50 PK O-Ring: 23 mm Nominal Inside Dia., 27 mm Nominal Outside Dia., 27 mm Actual Outside Dia., Std, 10 PK Backup Ring: Hytrel, For 250, 0.045 in Thick, Black, 25 PK O-Ring: 11 mm Nominal Inside Dia., 14 mm Nominal Outside Dia., 14 mm Actual Outside Dia., 100 PK O-Ring: 310, 1/2 in Nominal Inside Dia., 7/8 in Nominal Outside Dia., 75 Shore A, Brown, 10 PK O-Ring: 115 mm Nominal Inside Dia., 121 mm Nominal Outside Dia., 121 mm Actual Outside Dia., Black O-Ring: 043, 3 1/2 in Nominal Inside Dia., 3 5/8 in Nominal Outside Dia., 75 Shore A, Brown, 10 PK ◀◀ ◀ ▶ ▶▶
