Primary Sealing Material: Rubber Not Compatible With: Aromatic fuels; Diester lubricants; Petroleum fluids Applications: Ebullient cooled engine cooling systems Dash Size (in): 158 Compatible With: Alcohols; Automotive brake fluids; Hot, cold water; Ketones; Ozone and sunlight; Phosphate ester fluids; Silicone fluids; Some dilute acids; Steam (200 Degree C max); Steam (400 Degree F max) Seal/O-Ring Type: Standard Temperature (°F): -67 - 275 Cross Section Diameter (in): 0.103 Inside Diameter (in): 4.737 Outside Diameter (in): 4.943 Hardness (Shore A): 70 SAE AS568 Dash Size: -158 Color: Black Material: EPDM Material Description: EPDM rubber is capable of service temperatures of -55 to 121C and is resistant to air, water and glycol based fluids such as engine coolant and diesel exhaust fluid. EPDM rubber is not recommended in applications that require resistance to fuel oils, gasoline, diesel fuel and lubricants. Coating: None Color Notes: Actual o-ring color may differ from image. Notes: Dimensions and material descriptions provided for reference only.