PartsPuppy.com carries Nitrile (Buna-N) Rubber O-rings. These O-rings are one of the most widely used due to there excellent resistance to petroleum products. They have an operating temperature range (-40°F to +257°F) making them some of the best overall performers in the field of O-rings. Nitrile (Buna-N) Rubber O-rings are ideal for aerospace, automotive, propane and natural gas applications. Warning: At PartsPuppy.com we do not recommend Nitrile Rubber O-rings to replace specific OEM components in hazardous installations such as gas lines. Please have parts, that have anything to do with hazardous materials, replaced by an authorized service technician.