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: 033, 2 in Nominal Inside Dia., 2 1/8 in Nominal Outside Dia., 90 Shore A, Black, 25 PK Backup Ring: Hytrel, For 244, 0.045 in Thick, Black, 25 PK X-Ray and Metal Detectable O-Ring: 011, 5/16 in Nominal Inside Dia., 7/16 in Nominal Outside Dia. O-Ring: 80 mm Nominal Inside Dia., 90 mm Nominal Outside Dia., 90 mm Actual Outside Dia., 5 PK O-Ring: 229, 2 3/8 in Nominal Inside Dia., 2 5/8 in Nominal Outside Dia., 50 Shore A, Black, 10 PK O-Ring: 201, 3/16 in Nominal Inside Dia., 7/16 in Nominal Outside Dia., 90 Shore A, Black, 25 PK O-Ring: 327, 1 3/4 in Nominal Inside Dia., 2 1/8 in Nominal Outside Dia., 75 Shore A, Brown, 5 PK O-Ring: 28 mm Nominal Inside Dia., 30 mm Nominal Outside Dia., 30 mm Actual Outside Dia., 10 PK O-Ring: 133 mm Nominal Inside Dia., 141 mm Nominal Outside Dia., 141 mm Actual Outside Dia., 2 PK O-Ring: 3 mm Nominal Inside Dia., 6 mm Nominal Outside Dia., 6 mm Actual Outside Dia., Red, 50 PK O-Ring: 6.6 mm Nominal Inside Dia., 11.4 mm Nominal Outside Dia., 11.4 mm Actual Outside Dia., 50 PK O-Ring: 328, 1 7/8 in Nominal Inside Dia., 2 1/4 in Nominal Outside Dia., 70 Shore A, Black, 5 PK O-Ring: 363, 6 1/2 in Nominal Inside Dia., 6 7/8 in Nominal Outside Dia., 70 Shore A, Black, 5 PK O-Ring: 275, 10 1/2 in Nominal Inside Dia., 10 3/4 in Nominal Outside Dia., 70 Shore A, Red, 5 PK O-Ring: 20.8 mm Nominal Inside Dia., 25.6 mm Nominal Outside Dia., 70 Shore A, Black, 50 PK O-Ring: 8.7 mm Nominal Inside Dia., 12.29 mm Nominal Outside Dia., 70 Shore A, Black, 50 PK O-Ring: 202, 1/4 in Nominal Inside Dia., 1/2 in Nominal Outside Dia., 60 Shore A, White, 10 PK O-Ring: 10 mm Nominal Inside Dia., 14 mm Nominal Outside Dia., 14 mm Actual Outside Dia., 25 PK O-Ring: 112, 1/2 in Nominal Inside Dia., 11/16 in Nominal Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 171, 8 in Nominal Inside Dia., 8 3/16 in Nominal Outside Dia., 70 Shore A, Black, 10 PK ◀◀ ◀ ▶ ▶▶