Here is a reseal kit that is correct for the Crosman Mark I & Mark II CO2 pistols.
It includes the most common O-Rings that are needed to bring your
pistol back to life. The kit includes:
(2) Tube Cap/Piercing Knob Seal (O-Ring)
(1) Valve Body Seal (O-Ring)
(1) Piercing Pin Seal (O-Ring)
(2) Breech Bolt Seals (O-Ring) (Smaller one is for Mark II (.177 CAL) and the larger one is for Mark I (.22 CAL)
Thank You.