This Seal Kit consists of all the seals needed to rebuild the latest version of the Walther LP3. If you had an earlier version the piston seal was molded to the piston and you will need to replace the piston as well (part number WAL2439379). Additionally, the earlier version exhaust valve assemblies were different and had the seal molded into them. If you have one of these type exhaust valves you might need the valve bushing machined to insure a seal is made. This kit includes WAL2435497 (quantity 2 one for the breech seal and one for the back of the valve, WALLP3EVS exhaust valve seal, and WAL2331977 reproduction piston seal. There is a link to the parts diagrams on our "Airgun Links" web page.