Makita DPC7300, DPC7301, DPC7310, DPC7311, DPC7320,DPC7321 and DPC7331. Makita: DPC7300, DPC7301, DPC7310, DPC7311, DPC7320,DPC7321 and DPC7331. cylinder and piston kit. 50mm bore. you are buying what is shown in the photos.
eBay