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: 316, 7/8 in Nominal Inside Dia., 1 1/4 in Nominal Outside Dia., 70 Shore A, Red, 50 PK O-Ring: 45 mm Nominal Inside Dia., 51 mm Nominal Outside Dia., 51 mm Actual Outside Dia., 10 PK O-Ring: 127 mm Nominal Inside Dia., 132 mm Nominal Outside Dia., 132 mm Actual Outside Dia., 5 PK O-Ring: 220, 1 3/8 in Nominal Inside Dia., 1 5/8 in Nominal Outside Dia., 70 Shore A, Natural, 2 PK O-Ring: 234, 3 in Nominal Inside Dia., 3 1/4 in Nominal Outside Dia., 50 Shore A, Red, 5 PK O-Ring: 132, 1 3/4 in Nominal Inside Dia., 1 15/16 in Nominal Outside Dia., 70 Shore A, Black, 10 PK O-Ring: 904, 1/4 in Nominal Outside Dia., 0.495 in Actual Outside Dia., 70 Shore A, Red, 50 PK O-Ring: 234, 3 in Nominal Inside Dia., 3 1/4 in Nominal Outside Dia., 3.262 in Actual Outside Dia. O-Ring: 25 mm Nominal Inside Dia., 30 mm Nominal Outside Dia., 30 mm Actual Outside Dia., Std, 10 PK O-Ring: 427, 4 3/4 in Nominal Inside Dia., 5 1/4 in Nominal Outside Dia., 70 Shore A, Red, 5 PK O-Ring: 10.5 mm Nominal Inside Dia., 12.5 mm Nominal Outside Dia., 75 Shore A, Black, 25 PK O-Ring: 127, 1 7/16 in Nominal Inside Dia., 1 5/8 in Nominal Outside Dia., 90 Shore A, Black, 25 PK O-Ring: 94.4 mm Nominal Inside Dia., 100.6 mm Nominal Outside Dia., 75 Shore A, Black, 2 PK O-Ring: 60 mm Nominal Inside Dia., 64 mm Nominal Outside Dia., 64 mm Actual Outside Dia., Red, 2 PK O-Ring: 012, 3/8 in Nominal Inside Dia., 1/2 in Nominal Outside Dia., 75 Shore A, Black, Inch, 25 PK O-Ring: 011, 5/16 in Nominal Inside Dia., 7/16 in Nominal Outside Dia., 70 Shore A, Black, 100 PK O-Ring: 016, 5/8 in Nominal Inside Dia., 3/4 in Nominal Outside Dia., 75 Shore A, Black, Inch, 5 PK O-Ring: 118, 7/8 in Nominal Inside Dia., 1 1/16 in Nominal Outside Dia., 70 Shore A, Green, 10 PK O-Ring: 258, 6 in Nominal Inside Dia., 6 1/4 in Nominal Outside Dia., 70 Shore A, Black, Inch, 10 PK O-Ring: 64 mm Nominal Inside Dia., 76 mm Nominal Outside Dia., 76 mm Actual Outside Dia., 2 PK ◀◀ ◀ ▶ ▶▶