This listing is for the sleeve only.
It's the black rubber thing in the photos below.
If you want the kit that includes the
aluminum bushing, too, go here.
For those folks continually asking me
about a "top sleeve" - they don't exist and that is an unnecessary mod.
If Crosman determined that a top o-ring
was necessary, they would sell their products that way.
A correct installation does not leak
and does not require a top seal.