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Tube cap o-ring for Crosman 150 and 157, etc.   However, we do not recommend it be used for the tube cap.   We recommend the CRS150-054U.   The urethane O-rings were not available when this gun was made so Crosman could not specify them.  We recommend the CRS150-054 for use on the compression chamber  or valve body where it is not subjected to movement.