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: 25 mm Nominal Inside Dia., 35 mm Nominal Outside Dia., 35 mm Actual Outside Dia., Std, 25 PK O-Ring: 35 mm Nominal Inside Dia., 45 mm Nominal Outside Dia., 45 mm Actual Outside Dia., Std, 10 PK O-Ring: 118, 7/8 in Nominal Inside Dia., 1 1/16 in Nominal Outside Dia., 85 Shore A O-Ring: 470, 21 in Nominal Inside Dia., 21 1/2 in Nominal Outside Dia., 90 Shore A, Black O-Ring: 8.3 mm Nominal Inside Dia., 13.1 mm Nominal Outside Dia., 13.1 mm Actual Outside Dia., 25 PK O-Ring: 110, 3/8 in Nominal Inside Dia., 9/16 in Nominal Outside Dia., 75 Shore A, Brown, 25 PK O-Ring: 19.5 mm Nominal Inside Dia., 24.5 mm Nominal Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 33 mm Nominal Inside Dia., 45 mm Nominal Outside Dia., 45 mm Actual Outside Dia., 5 PK O-Ring: 021, 15/16 in Nominal Inside Dia., 1 1/16 in Nominal Outside Dia., 70 Shore A, Black, 50 PK O-Ring: 16 mm Nominal Inside Dia., 19 mm Nominal Outside Dia., 19 mm Actual Outside Dia., Std, 25 PK O-Ring: 015, 9/16 in Nominal Inside Dia., 11/16 in Nominal Outside Dia., 70 Shore A, Black, 100 PK O-Ring: 120 mm Nominal Inside Dia., 125 mm Nominal Outside Dia., 125 mm Actual Outside Dia., 5 PK O-Ring: 33 mm Nominal Inside Dia., 37 mm Nominal Outside Dia., 37 mm Actual Outside Dia., 10 PK O-Ring: 013, 7/16 in Nominal Inside Dia., 9/16 in Nominal Outside Dia., 75 Shore A, Black, X, 25 PK O-Ring: 45/64 in Nominal Inside Dia., 7/8 in Nominal Outside Dia., 55 Shore D, White, 50 PK O-Ring: 69 mm Nominal Inside Dia., 72 mm Nominal Outside Dia., 72 mm Actual Outside Dia., 25 PK O-Ring: 039, 2 3/4 in Nominal Inside Dia., 2 7/8 in Nominal Outside Dia., 75 Shore A, Brown, 10 PK O-Ring: 211, 13/16 in Nominal Inside Dia., 1 1/16 in Nominal Outside Dia., 70 Shore A, Black, 5 PK O-Ring: 10 mm Nominal Inside Dia., 14 mm Nominal Outside Dia., 14 mm Actual Outside Dia., Std, 25 PK O-Ring: 195 mm Nominal Inside Dia., 200 mm Nominal Outside Dia., 200 mm Actual Outside Dia., 5 PK ◀◀ ◀ ▶ ▶▶