Its kinda funny , the lady who took my order at Crosman told me this gasket was a very common one , used in more that one application.I may be wrong , but this # 130-036....I think its a Transfer Port Gasket for all calibers and is also used in the 2240 line as well. She said something like "Yes we use that one on a few different airguns".Anyway , when I ordered my parts , I ordered about 6 xtra of all O-Rings and gaskets. Its wasn't a lot of money and its handy to have xtras in my gun tool box.Im anxious to get an extended air chamber , either from Jim Gaska or TT. I tried using a .25 valve assy in my .22, along with the Transfer port from the .25 as well. It was just too much. Im replacing the Valve assy....putting the .22 back in . Im leaving the larger Transfer port for now. Im desperate for a 10lb or 16lb hammer spring (I read that this is key to shooting the heavy pellets over 900fps ). I've had to lay off my rifle....been helping my Daughter out ....life...you understand ? Im making time to get it back to usable condition. Thanks for lending me you ear ....good luck with your project.