Rebuild your GK1 main valve with this kit. 

Compatibility: 

• This kit will work with all calibers (.22/.25/.30) of the GK1.

We also recommend you buy these tools to perform the repair: 

• Valve Seat Removal Toolset

Note: This valve may look different than the older version in this video. The one sold here is a newer version that Huben now installs in all new GK1s. It is backward compatible with old GK1s.