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: 113, 9/16 in Nominal Inside Dia., 3/4 in Nominal Outside Dia., 55 Shore D, White, 25 PK O-Ring: 328, 1 7/8 in Nominal Inside Dia., 2 1/4 in Nominal Outside Dia., 75 Shore A, Brown, 5 PK O-Ring: 130, 1 5/8 in Nominal Inside Dia., 1 13/16 in Nominal Outside Dia., 75 Shore A, Black O-Ring: 13 mm Nominal Inside Dia., 17 mm Nominal Outside Dia., 17 mm Actual Outside Dia., 50 PK O-Ring: 75 mm Nominal Inside Dia., 80 mm Nominal Outside Dia., 80 mm Actual Outside Dia., Std, 2 PK O-Ring: 113, 9/16 in Nominal Inside Dia., 3/4 in Nominal Outside Dia., 75 Shore A, Brown, Std, 50 PK O-Ring: 215, 1 1/16 in Nominal Inside Dia., 1 5/16 in Nominal Outside Dia., 70 Shore A, Black, 10 PK O-Ring: 105 mm Nominal Inside Dia., 110 mm Nominal Outside Dia., 110 mm Actual Outside Dia., 2 PK O-Ring: 8.3 mm Nominal Inside Dia., 13.1 mm Nominal Outside Dia., 13.1 mm Actual Outside Dia., 50 PK O-Ring: 031, 1 3/4 in Nominal Inside Dia., 1 7/8 in Nominal Outside Dia., 75 Shore A, Blue, 2 PK O-Ring: 314, 3/4 in Nominal Inside Dia., 1 1/8 in Nominal Outside Dia., 70 Shore A, Red, 50 PK O-Ring: 121, 1 1/16 in Nominal Inside Dia., 1 1/4 in Nominal Outside Dia., 85 Shore A O-Ring: 40 mm Nominal Inside Dia., 48 mm Nominal Outside Dia., 48 mm Actual Outside Dia., 25 PK O-Ring: 020, 7/8 in Nominal Inside Dia., 1 in Nominal Outside Dia., 1.004 in Actual Outside Dia. O-Ring: 12 mm Nominal Inside Dia., 14 mm Nominal Outside Dia., 14 mm Actual Outside Dia., 100 PK O-Ring: 123 mm Nominal Inside Dia., 129 mm Nominal Outside Dia., 129 mm Actual Outside Dia., 5 PK O-Ring: 34 mm Nominal Inside Dia., 40 mm Nominal Outside Dia., 40 mm Actual Outside Dia., 10 PK O-Ring: 30 mm Nominal Inside Dia., 34 mm Nominal Outside Dia., 34 mm Actual Outside Dia., 50 PK O-Ring: 36 mm Nominal Inside Dia., 40 mm Nominal Outside Dia., 40 mm Actual Outside Dia., 10 PK O-Ring: 205, 7/16 in Nominal Inside Dia., 11/16 in Nominal Outside Dia., 70 Shore A, Red, 25 PK ◀◀ ◀ ▶ ▶▶