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: 153, 3 1/2 in Nominal Inside Dia., 3 11/16 in Nominal Outside Dia., 70 Shore A, Black, 10 PK Backup Ring, Contoured: Buna N, For 465, 0.117 in Thick, 0.344 in Radius, 2 PK O-Ring: 84 mm Nominal Inside Dia., 88 mm Nominal Outside Dia., 88 mm Actual Outside Dia., 10 PK O-Ring: 342, 3 5/8 in Nominal Inside Dia., 4 in Nominal Outside Dia., 80 Shore A, Black, 2 PK O-Ring: 392, 23 in Nominal Inside Dia., 23 3/8 in Nominal Outside Dia., 23.36 in Actual Outside Dia. O-Ring: 33.3 mm Nominal Inside Dia., 38.1 mm Nominal Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 121, 1 1/16 in Nominal Inside Dia., 1 1/4 in Nominal Outside Dia., 75 Shore A, Black, 2 PK O-Ring: 32.1 mm Nominal Inside Dia., 35.3 mm Nominal Outside Dia., 70 Shore A, Black, Metric, 50 PK O-Ring: 147 mm Nominal Inside Dia., 153 mm Nominal Outside Dia., 153 mm Actual Outside Dia., Black O-Ring: 110, 3/8 in Nominal Inside Dia., 9/16 in Nominal Outside Dia., 70 Shore A, Black, 5,000 PK O-Ring: 64 mm Nominal Inside Dia., 68 mm Nominal Outside Dia., 68 mm Actual Outside Dia., Std, 25 PK Backup Ring, Contoured: Buna N, For 462, 0.117 in Thick, 0.344 in Radius, 2 PK O-Ring: 475, 26 in Nominal Inside Dia., 26 1/2 in Nominal Outside Dia., 26.49 in Actual Outside Dia. O-Ring: 127 mm Nominal Inside Dia., 135 mm Nominal Outside Dia., 135 mm Actual Outside Dia., 2 PK O-Ring: 030, 1 5/8 in Nominal Inside Dia., 1 3/4 in Nominal Outside Dia., 75 Shore A, Blue, 5 PK O-Ring: 270, 9 in Nominal Inside Dia., 9 1/4 in Nominal Outside Dia., 9.262 in Actual Outside Dia. O-Ring: 013, 7/16 in Nominal Inside Dia., 9/16 in Nominal Outside Dia., 70 Shore A, Red, Inch, 10 PK O-Ring: 9 mm Nominal Inside Dia., 13 mm Nominal Outside Dia., 13 mm Actual Outside Dia., Std, 25 PK O-Ring: 022, 1 in Nominal Inside Dia., 1 1/8 in Nominal Outside Dia., 80 Shore A, Black, 10 PK O-Ring: 014, 1/2 in Nominal Inside Dia., 5/8 in Nominal Outside Dia., 70 Shore A, Black, Inch, 25 PK ◀◀ ◀ ▶ ▶▶