As far as I know only JG airguns and Mac1 sells a finished part. What Crosman sells for the Dans will only cause you grief as it is a part that needs one more step done in the forming to be beyond worthless.
At the veryy minimum you need the factory check valve reshaped or you will be going in there very soon to do the work again. I have about 11 tools and as many parts I make to do an exceptional job. I don't sell tools as I know what it takes and one tool is a multi tool deal that is a minimum requirement that is a real easy tool to make a mess with and then it breaks. The back end takes special tools so it is a bit more of a challenge than the front. When we supply valve kits or lever pivots we need to know which one you have. Later levers has rectangle on one side and round on the other. There are two kinds of rivets and if original your rivet ends will be small and round circular. I make a STeel front plug if you need to change the plug. If the front plug hole is enlarged you need to peen the part over a drift to close the holes down enough to Hold the spring pin adequately. Change the rivet in the lever and change the link pivot pin to eliminate wear and assemble it with a fresh pin on the primary plug pivot so the plug holds it well. Mop all the crud out of the tube with a rag on dowel and make sure you won't be pushing any crud/goo into the valve with the new cup fitted. If you drive the two front spring pins then line up the piston pivot with the aft pin hole up front and push the link pin out you can pull the lever and piston out of the gun for R&R. When they don't[pump at all you don't know if they hold air till you have serviced thwe front end so you may as well do that and rebuild the valve section only if it is leaking. The intake and exhaust valve Crosman now sells are no where near as good as what is in there so there is not an upside to new parts if it still holds. That gets fried easily iif the gun sees little to zero lubes and is the most likely scenario. Often if they have not seen any abuse the first thing to try is a Pump cup and fresh lever pivots and front Pin to see if it is just a failed pump cup.
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