This is the seal kit for all Crosman 2100's.

All seals to repair your 2100 are included:

Pump Cup
Valve O-ring (outer casing)
Valve O-ring (inner casing)
Check valve
Valvestem
Valvespring
Breech seal


Please Note: You may need to shorten the included replacement valvestem slightly (saw and file, or grinder) for proper fit in your rifle.