Dash Size (in): 137 Coating: None Primary Sealing Material: Rubber Seal/O-Ring Type: Standard Cross Section Diameter (in): 0.103 Inside Diameter (in): 2.05 Outside Diameter (in): 2.256 Hardness (Shore A): 75 SAE AS568 Dash Size: -137 Material: NBR - Nitrile Material Description: Nitrile (NBR) rubber is capable of service temperatures of -40 to 100C and is resistant to fuel oils, gasoline, ultra low sulfur diesel fuel and lubricants. Nitrile rubber is not recommended for applications that require resistance to bio-diesel or coolant. Color Notes: Actual o-ring color may differ from image. Notes: Dimensions and material descriptions provided for reference only.