Sterling Seal ORBN425 Number-425 Standard O-Ring， Buna Nitrile Rubber， 4-1/2" ID， 5" OD</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>For use across a wide temperature range from -30 degrees F (-34 degrees C) to 250 degrees F (121 degrees C)</li><li>Oil resistant applications of all types. Low temperature military uses. Off-road equipment. Automotive， marine， aircraft fuel systems</li><li>Compatible with Aliphatic Hydrocarbons (propane， butane， petroleum oil， mineral oils and greases， diesel fuel and fuel oil)</li><li>Not Compatible with product fuels with a high aromatic content; aromatic hydrocarbons (benzene); Chlorinated hydrocarbons (Trichloroethylene)</li><li>Buna N or Nitrile has good mechanical properties when compared with other elastomers and high wear resistance. Good/Excellent resistance to many petroleum oils/greases， hydraulic fluids， alcohol， mineral oil and grease</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/31sSWCEz07L.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/61xGK5q6DnL.jpg' noproxy></br>