Cylinder nozzles are prone to damage by dropping, misfed and usual wear and tear, causing compression loss and misfeed. Nozzle spring and the O-ring are also parts that need replacing, but sadly they were not readily available. FCC again has a solution. Package contains a nickel plated steel nozzle, a nozzle spring, and o-rings for the nozzle and small O-ring for the piston. Compatible for FCC, Velocity, CTW, DTW and Ferrari Cylinders. Use of modest amount of thread-lock recommended.