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. Please see our Technical Pages to find out why you should replace all seals in all airguns at the same time.
