NOTICE: The pressure chamber seal and washer in this kit will not work on all Daisy 901's. Older models will likely need item # 151749918749, the old style rebuild kit. New rebuild kit for the new style 901 Daisy Powerline air rifle. This kit works for guns with an Aluminum pump tube only. I have pictures in this listing showing both styles of pressure chamber seals, this kit is the new style. It will work for the guns made in china, they have are marked as such and have an aluminum pump tube. This kit will replace the most common wear parts on the rifle. It includes new O-rings for the pump tube and pump head, new O-ring for the exhaust valve, new foam oil wiper and a new pressure chamber seal assembly.