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.
Note: This is the newest, updated all-aluminum piston- extreme pumping heat will not affect this unit as can be the case using Delrin/Acetal/plastic pistons in extreme applications.
One thing that must be mentioned; These are heavy-duty all aluminum units, and as such they are not as forgiving of pump tube issues as would be a/the older style Delrin unit. It is always a good idea to run emery cloth or paper on a dowel up and down the tube prior to installing the FTP kit to ensure there are no burrs or rough edges that may cause piston 'dragging' and scraping issues.