4-1/4 ID O-Ring Standard
Many sizes available to cover most hydraulic, industrial, and automotive applications. Made of nitrile rubber (NBR). The most widely used O-Ring elastomer. Excellent resistance to petroleum products. Excellent compression set, tear and abrasion resistance. Does not have good resistance to ozone, sunlight, or weather, unless specifically compounded. Should not be stored in direct sunlight or near motors or other electrical equipment which may generate ozone.