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: 334, 2 5/8 in Nominal Inside Dia., 3 in Nominal Outside Dia., 50 Shore A, Black, 5 PK O-Ring: 145, 2 9/16 in Nominal Inside Dia., 2 3/4 in Nominal Outside Dia., 70 Shore A, Natural O-Ring: 019, 13/16 in Nominal Inside Dia., 15/16 in Nominal Outside Dia., 70 Shore A, Black, 5 PK O-Ring: 228, 2 1/4 in Nominal Inside Dia., 2 1/2 in Nominal Outside Dia., 60 Shore A, White, 2 PK Backup Ring, Contoured: Buna N, For 228, 0.05 in Thick, 0.174 in Radius, 50 PK O-Ring: 37 mm Nominal Inside Dia., 43 mm Nominal Outside Dia., 43 mm Actual Outside Dia., 10 PK O-Ring: 151, 3 in Nominal Inside Dia., 3 3/16 in Nominal Outside Dia., 70 Shore A, Black, 10 PK O-Ring: 433, 5 1/2 in Nominal Inside Dia., 6 in Nominal Outside Dia., 90 Shore A, Black, Inch, 2 PK Backup Ring: Hytrel, For 326, 0.065 in Thick, Orange, 25 PK O-Ring: 49 mm Nominal Inside Dia., 52 mm Nominal Outside Dia., 52 mm Actual Outside Dia., 25 PK O-Ring: 332, 2 3/8 in Nominal Inside Dia., 2 3/4 in Nominal Outside Dia., 90 Shore A, Black, 2 PK O-Ring: 44 mm Nominal Inside Dia., 48 mm Nominal Outside Dia., 48 mm Actual Outside Dia., Red, 10 PK O-Ring: 3.8 mm Nominal Inside Dia., 7.6 mm Nominal Outside Dia., 7.6 mm Actual Outside Dia., 100 PK O-Ring: 310, 1/2 in Nominal Inside Dia., 7/8 in Nominal Outside Dia., 90 Shore A, Black, 10 PK O-Ring: 38 mm Nominal Inside Dia., 42 mm Nominal Outside Dia., 42 mm Actual Outside Dia., Std, 50 PK O-Ring: 227, 2 1/8 in Nominal Inside Dia., 2 3/8 in Nominal Outside Dia., 55 Shore D, White, 5 PK O-Ring: 228, 2 1/4 in Nominal Inside Dia., 2 1/2 in Nominal Outside Dia., 85 Shore A O-Ring: 212, 7/8 in Nominal Inside Dia., 1 1/8 in Nominal Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 276, 11 in Nominal Inside Dia., 11 1/4 in Nominal Outside Dia., 70 Shore A, Red, 5 PK O-Ring: 268, 8 1/2 in Nominal Inside Dia., 8 3/4 in Nominal Outside Dia., 70 Shore A, Black, 5 PK ◀◀ ◀ ▶ ▶▶
