This is a replacement O.S. Cylinder & Piston, and is intended for use with the O.S. .21 XZ-B.
NOTE: You will need to detach the old connecting rod and re-attach it to the new piston during replacement. We recommend that when you replace the piston/sleeve on any engine, you also change the connecting rod and wrist pin clips.
This product was added to our catalog on August 23, 2011.