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: 244, 4 1/4 in Nominal Inside Dia., 4 1/2 in Nominal Outside Dia., 70 Shore A, Black, X, 5 PK O-Ring: 41 mm Nominal Inside Dia., 50 mm Nominal Outside Dia., 50 mm Actual Outside Dia., 10 PK O-Ring: 014, 1/2 in Nominal Inside Dia., 5/8 in Nominal Outside Dia., 70 Shore A, Black, 100 PK O-Ring: 60 mm Nominal Inside Dia., 64 mm Nominal Outside Dia., 64 mm Actual Outside Dia., Std, 5 PK O-Ring: 320, 1 1/8 in Nominal Inside Dia., 1 1/2 in Nominal Outside Dia., 90 Shore A, Black, 10 PK O-Ring: 020, 7/8 in Nominal Inside Dia., 1 in Nominal Outside Dia., 70 Shore A, Black, Inch, 50 PK O-Ring: 217, 1 3/16 in Nominal Inside Dia., 1 7/16 in Nominal Outside Dia., 90 Shore A, Black, 25 PK O-Ring: 36 mm Nominal Inside Dia., 42 mm Nominal Outside Dia., 42 mm Actual Outside Dia., Std, 5 PK Backup Ring: Hytrel, For 222, 0.045 in Thick, Orange, 50 PK O-Ring: 63 mm Nominal Inside Dia., 73 mm Nominal Outside Dia., 73 mm Actual Outside Dia., 75 Shore A O-Ring: 112, 1/2 in Nominal Inside Dia., 11/16 in Nominal Outside Dia., 60 Shore A, White, 10 PK O-Ring: 378, 10 1/2 in Nominal Inside Dia., 10 7/8 in Nominal Outside Dia., 90 Shore A, Black O-Ring: 340 mm Nominal Inside Dia., 350 mm Nominal Outside Dia., 350 mm Actual Outside Dia., Black O-Ring: 52.6 mm Nominal Inside Dia., 64 mm Nominal Outside Dia., 64 mm Actual Outside Dia., Black O-Ring: 34 mm Nominal Inside Dia., 40 mm Nominal Outside Dia., 40 mm Actual Outside Dia., Red, 10 PK O-Ring: 106, 3/16 in Nominal Inside Dia., 3/8 in Nominal Outside Dia., 90 Shore A, Black, 50 PK O-Ring: 5 mm Nominal Inside Dia., 7.4 mm Nominal Outside Dia., 7.4 mm Actual Outside Dia., 50 PK O-Ring: 471, 22 in Nominal Inside Dia., 22 1/2 in Nominal Outside Dia., 70 Shore A, Black O-Ring: 9 mm Nominal Inside Dia., 15 mm Nominal Outside Dia., 15 mm Actual Outside Dia., Red, 10 PK O-Ring: 105 mm Nominal Inside Dia., 115 mm Nominal Outside Dia., 115 mm Actual Outside Dia., 2 PK ◀◀ ◀ ▶ ▶▶