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: 257, 5 7/8 in Nominal Inside Dia., 6 1/8 in Nominal Outside Dia., 75 Shore A, Black, 2 PK O-Ring: 443, 7 1/2 in Nominal Inside Dia., 8 in Nominal Outside Dia., 8.025 in Actual Outside Dia. O-Ring: 216, 1 1/8 in Nominal Inside Dia., 1 3/8 in Nominal Outside Dia., 70 Shore A, Black, 25 PK X-Ray and Metal Detectable O-Ring: 112, 1/2 in Nominal Inside Dia., 11/16 in Nominal Outside Dia. O-Ring: 110, 3/8 in Nominal Inside Dia., 9/16 in Nominal Outside Dia., 0.568 in Actual Outside Dia. O-Ring: 241, 3 7/8 in Nominal Inside Dia., 4 1/8 in Nominal Outside Dia., 75 Shore A, Black, Inch O-Ring: 98 mm Nominal Inside Dia., 106 mm Nominal Outside Dia., 106 mm Actual Outside Dia., 10 PK O-Ring: 277, 11 1/2 in Nominal Inside Dia., 11 3/4 in Nominal Outside Dia., 70 Shore A, Red, 5 PK O-Ring: 013, 7/16 in Nominal Inside Dia., 9/16 in Nominal Outside Dia., 75 Shore A, Black, 25 PK O-Ring: 017, 11/16 in Nominal Inside Dia., 13/16 in Nominal Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 395, 26 in Nominal Inside Dia., 26 3/8 in Nominal Outside Dia., 26.36 in Actual Outside Dia. O-Ring: 20 mm Nominal Inside Dia., 30 mm Nominal Outside Dia., 30 mm Actual Outside Dia., Std, 25 PK O-Ring: 112, 1/2 in Nominal Inside Dia., 11/16 in Nominal Outside Dia., 70 Shore A, Blue, 5 PK O-Ring: 016, 5/8 in Nominal Inside Dia., 3/4 in Nominal Outside Dia., 70 Shore A, Black, Inch, 25 PK O-Ring: 108 mm Nominal Inside Dia., 114 mm Nominal Outside Dia., 114 mm Actual Outside Dia., 2 PK O-Ring: 418, 3 5/8 in Nominal Inside Dia., 4 1/8 in Nominal Outside Dia., 70 Shore A, Black, 5 PK O-Ring: 3.5 mm Nominal Inside Dia., 5.5 mm Nominal Outside Dia., 5.5 mm Actual Outside Dia., 50 PK O-Ring: 208, 5/8 in Nominal Inside Dia., 7/8 in Nominal Outside Dia., 90 Shore A, Black, 25 PK O-Ring: 7.5 mm Nominal Inside Dia., 13.5 mm Nominal Outside Dia., 13.5 mm Actual Outside Dia., 50 PK O-Ring: 41 mm Nominal Inside Dia., 47 mm Nominal Outside Dia., 47 mm Actual Outside Dia., Std, 5 PK ◀◀ ◀ ▶ ▶▶