The is a flat-top piston and valve kit for use with Crosman 13xx and 2289 Multi Stroke Pneumatic (pumper) airguns.

By eliminating headspace, a more efficient pump is achieved (more velocity per pump stroke). It is the best “bang for the buck” upgrade available for these airguns. Less pumps for the same power achieved using the stock piston and valve.

This kit includes the flat top piston, modified Crosman valve and new o-rings to ensure that once it's installed, your airgun will operate at peak efficiency.