PUMP PISTON CUP SEAL for 13XX
This is a new pump piston cup seal. It fits 1377, 1322, 2289G Backpacker, PC77 and 1300KT models.
For a brief couple of years Crosman had switched over to a pump piston that had a steel pin holding the cup seal in place. Thankfully they have discontinued that pathetically bad design. They now use a new, much better piston that does not have a pin through the cup seal. This cup seal fits the new piston and all of the earlier versions that did not use a pin to hold the cup seal in place.