Cross Section Diameter (mm): 2.62 Outside Diameter (mm): 43.01 Inside Diameter (mm): 37.77 SAE AS568 Dash Size: -128 Material: FKM (75),FKM - Fluoroelastomer,FKM Material FKM rubber is capable of service temperatures of -40 to 150C and is resistant to air, fuel (including bio-diesel), lubricants and oils. FKM rubber should not be used in applications that require resistance to water or coolant. Hardness (Shore A): 75 Coating: PTFE coating protects the O-Ring from installation damage and provides ease of assembly. Color: Light Blue Color Notes: Actual o-ring color may differ from image. Notes: Dimensions and material descriptions provided for reference only. Applications: High temperature applications requiring resistance to air, fuels, lubricants and hydraulic fluids Not Compatible With: Amines; Brake fluids; Engine Coolant; Fire Resistant Fluids; Ketones; Steam; Water Temperature (°C): -40 - 175 Compatible With: Diester lubricants; Halogenated hydrocarbons (above 100 Deg. C); Highly resistant to compression set; Petroleum fluids; Phosphate ester fluids; Silicone fluids; Some acids Seal/O-Ring Type: Standard